Select Board & Class
write 5-6 differences between isobars and isotopes in a tabular form .
how to find valency of an element?
what were the drawbacks of thomson model of atom
which has highest e/m ratio
a) he 2+
b)h
C)H+
d) he+
Calculate the number of molecules in 8g of Oxygen ?
find the valency of sulphur .[atomic no.=16
what are canal rays ?
5 examples of isotopes and 5 examples of isobars
What is the valency of copper?
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
Compare the properties of electrons, protons and neutrons.
force on electron F=eE what e and E stands for.
what are the application of isotopes
What are the drawbacks of Rutherfords atomic model?
Q.1. How many molecules are present in
(a) 9 grams of water
(b) 17 grams of amonia
Q.2. Calculate the number of moles in 17 grams of H2O2
Q.3. Show that 12 grams of carbon-12 contains 6.023 x 1023 atoms of 12C
Q.4. What is the mass of one atom of hydrogen ?
Q.5. How many moles of Mg atoms are there in 100 grams of magnesium ?
Q.6. Neon gas consist of single atoms. What mass of neon contains 6.023 x 1023 atoms ?
explain the rutherford's gold foil experiment with the help of diagram?
difference between electrons protons and neutrons...also find the relation between the three
Who discovered proton? Golstein or Rutherford?
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
an ion M3+ contains 10 electrons and 14 neutrons.What are the atomic mass and mass number of the element M ? name the element
Q1 Tabulate name of elements,their latin names and symbols.
what is the difference between sodium ion and sodium atom ?
what are sub shells ?? Who discovered them and how ??? the discoverer of sub shells disproved which scientist
what is electrovalency and covalency
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
What does indivisible mean in terms of chemistry?
why is the valency of phosphorus 3 & 5 both ?
The charge/mass ratio of electron
a) depends upon nature of gas
b) depends upon nature of electrodes
c) remains constant
d) depends upon both nature of gas and nature of electrodes
How to learn the 30 elements of modern periodic table Quickly?
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
What is the valency of Aluminium whose atomic number is 13 ? Give reason.
what is the valency of gold, silver and lead and can you explai how we can find the valency of a compound like NH4, SO2, CO3 etc.
what are properties of anode rays x rays cathode rays and alpha particles
wht r d drawbacks of bohr's model of an atom??
Give 6 examples of isobars .........
How many atoms are present in SO4 raised to 2- ion and NH4+ ion???
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
discrete orbits are also known as_____
discovery of electrons
Calculate the percentage of
[a] Water of crystallization in CuSO4.5H2O
[B] Potassium in K2CO3
[c] Oxygen in 22g of CO2
[D] Hydrogen in 36g of water
State 3 characteristics of canal rays.
Calculate number of neutrons present in 12 × 1025 atoms of oxygen (8O17). (Given NA = 6 × 1023 atoms)
(A) 1800 (B) 1600 (C) 1800 NA (D) 3200 NA
what is the valency of silicon ? is it positive or negative ? is it a metal or non-metal or a metalloid ?
State two main postulates of Thomson model of an atom
State 2 point difference between nucleons and nucleus
applications and examples of isotopes an isobars ?
Calcualte the effective nuclear charge ( Z*) of Na+.
p.s. Don't know to which class this question would belong to!:P I'm reading it in IIT coaching!
the description of atomic particles of two elements X and Y is given below:
X Y
protons 8 8
neutrons 8 9
electrons 8 8
i) what is the atomic number of Y?
ii) what is the mass number of X?
iii) what is the relation between X and Y?
iv) which element/elements do they represent?
v) write the electronic configuration of X.
vi) write the cation/anion formed by the element.
Why do like charges repel and how does unlike charges attract each other
what is difference between Isotopes, Isobars and Isotones
give the atomic masses of important element for class 9
an element X forms an oxide with formula X2O3
state the valency of X,write the formula of chloride of X and sulphate of X.
difference between isotope and isobars
The electronic configuration of potassium(K) is 2,8,8,1 instead of 2,8,9 thogh the M shell can accommodate up to 18 electrons. Explain
mam please explain what problem of atomic structure was solved by discoof nutron
who discovered the proton? E. goldstein or rutherford?
According to bohr's model of an atom, electron revolves around the nucleus in the fixed orbits called stationary states or energy shells. Electron does not emit nor absorb energy when it revolves. WHY IS IT SO?
Bohr argued that Rutherford's model would be highly unstable because according to him (bohr) if an electron revolves continously it would be subjected to accelaration. Thus, electron will continously emit radiation and fall in the nucleus. But when electron revolves around the nucleus in Bohr's model it also changes its energy shells, then why the bohr's model is not unstable?
If Z = 3, what would be the valency of the element? Also, name the element.
write three significant features of Bohr's model of an atom.
Q.AMONGST THE ELECTRON REVOLVING AROUND THE NUCLEUS WHICH ELECTRONS
1) DETERMINE THE CHEMICAL PROPERTIES OF AN ELEMENT ?
2)DO NOT DETERMINE THE CHEMICAL PROPERTIES OF AN ELEMENT?
GIVE REASONS FOR YOUR ANSWER.
Name three feature of rutherford's model
what are cathode rays and anode rays?
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)
Syllabus
write 5-6 differences between isobars and isotopes in a tabular form .
how to find valency of an element?
what were the drawbacks of thomson model of atom
which has highest e/m ratio
a) he 2+
b)h
C)H+
d) he+
Calculate the number of molecules in 8g of Oxygen ?
find the valency of sulphur .[atomic no.=16
BALANCE THIS EQUATION
what are canal rays ?
5 examples of isotopes and 5 examples of isobars
What is the valency of copper?
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
HCl,
H2,
H2O,
NH3,
CH3OH,
PCl5
Compare the properties of electrons, protons and neutrons.
force on electron F=eE what e and E stands for.
what are the application of isotopes
What are the drawbacks of Rutherfords atomic model?
which of the following liquids?
(1) 0.5% salt solution (2) 0.9% salt solution
(3) 1.2% salt solution (4) distilled (pure) water
Q.1. How many molecules are present in
(a) 9 grams of water
(b) 17 grams of amonia
Q.2. Calculate the number of moles in 17 grams of H2O2
Q.3. Show that 12 grams of carbon-12 contains 6.023 x 1023 atoms of 12C
Q.4. What is the mass of one atom of hydrogen ?
Q.5. How many moles of Mg atoms are there in 100 grams of magnesium ?
Q.6. Neon gas consist of single atoms. What mass of neon contains 6.023 x 1023 atoms ?
explain the rutherford's gold foil experiment with the help of diagram?
difference between electrons protons and neutrons...also find the relation between the three
Who discovered proton? Golstein or Rutherford?
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
an ion M3+ contains 10 electrons and 14 neutrons.What are the atomic mass and mass number of the element M ? name the element
Q1 Tabulate name of elements,their latin names and symbols.
what is the difference between sodium ion and sodium atom ?
what are sub shells ?? Who discovered them and how ??? the discoverer of sub shells disproved which scientist
what is electrovalency and covalency
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
What does indivisible mean in terms of chemistry?
why is the valency of phosphorus 3 & 5 both ?
The charge/mass ratio of electron
a) depends upon nature of gas
b) depends upon nature of electrodes
c) remains constant
d) depends upon both nature of gas and nature of electrodes
How to learn the 30 elements of modern periodic table Quickly?
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
1) write the electronic configuration of element X
2)write the electronic configuration of anion of element Y
3) write the formula of the compound formed by the combination of X and Y.
What is the valency of Aluminium whose atomic number is 13 ? Give reason.
a) What is its atomic no.?
b) State its valency
c) Identify the element.
what is the valency of gold, silver and lead and can you explai how we can find the valency of a compound like NH4, SO2, CO3 etc.
what are properties of anode rays x rays cathode rays and alpha particles
wht r d drawbacks of bohr's model of an atom??
Give 6 examples of isobars .........
How many atoms are present in SO4 raised to 2- ion and NH4+ ion???
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
discrete orbits are also known as_____
discovery of electrons
Calculate the percentage of
[a] Water of crystallization in CuSO4.5H2O
[B] Potassium in K2CO3
[c] Oxygen in 22g of CO2
[D] Hydrogen in 36g of water
State 3 characteristics of canal rays.
Calculate number of neutrons present in 12 × 1025 atoms of oxygen (8O17). (Given NA = 6 × 1023 atoms)
(A) 1800 (B) 1600 (C) 1800 NA (D) 3200 NA
what is the valency of silicon ? is it positive or negative ? is it a metal or non-metal or a metalloid ?
State two main postulates of Thomson model of an atom
State 2 point difference between nucleons and nucleus
applications and examples of isotopes an isobars ?
Calcualte the effective nuclear charge ( Z*) of Na+.
p.s. Don't know to which class this question would belong to!:P I'm reading it in IIT coaching!
the description of atomic particles of two elements X and Y is given below:
X Y
protons 8 8
neutrons 8 9
electrons 8 8
i) what is the atomic number of Y?
ii) what is the mass number of X?
iii) what is the relation between X and Y?
iv) which element/elements do they represent?
v) write the electronic configuration of X.
vi) write the cation/anion formed by the element.
Why do like charges repel and how does unlike charges attract each other
18. a) Illustrate the postulates of Neil Bohr to explain the model of an atom.
b) Identify the element, write electronic configuration and number of neutrons present in the atom represented by
b) Atomic number of an element is 17 . Identify the element and mention Its valency.
what is difference between Isotopes, Isobars and Isotones
give the atomic masses of important element for class 9
an element X forms an oxide with formula X2O3
rnstate the valency of X,write the formula of chloride of X and sulphate of X.
a) the cation
b) the pair of isobars and
c) the pair of isotopes
Also give reason in each case.
difference between isotope and isobars
Reason: Nucleus of an atom consists of Protons and Neutrons.
*What is the answer?*
a) Both A and R is true and R is the correct explanation of A.
b) Both A and R is true but R is not the correct explanation of A.
c) A is true but R is false.
d) Both A and R are false.
The electronic configuration of potassium(K) is 2,8,8,1 instead of 2,8,9 thogh the M shell can accommodate up to 18 electrons. Explain
mam please explain what problem of atomic structure was solved by discoof nutron
who discovered the proton? E. goldstein or rutherford?
According to bohr's model of an atom, electron revolves around the nucleus in the fixed orbits called stationary states or energy shells. Electron does not emit nor absorb energy when it revolves. WHY IS IT SO?
Bohr argued that Rutherford's model would be highly unstable because according to him (bohr) if an electron revolves continously it would be subjected to accelaration. Thus, electron will continously emit radiation and fall in the nucleus. But when electron revolves around the nucleus in Bohr's model it also changes its energy shells, then why the bohr's model is not unstable?
If Z = 3, what would be the valency of the element? Also, name the element.
write three significant features of Bohr's model of an atom.
Q.AMONGST THE ELECTRON REVOLVING AROUND THE NUCLEUS WHICH ELECTRONS
1) DETERMINE THE CHEMICAL PROPERTIES OF AN ELEMENT ?
2)DO NOT DETERMINE THE CHEMICAL PROPERTIES OF AN ELEMENT?
GIVE REASONS FOR YOUR ANSWER.
Name three feature of rutherford's model
what are cathode rays and anode rays?