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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
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
Calculate the number of molecules in 8g of Oxygen ?
which has highest e/m ratio
a) he 2+
find the valency of sulphur .[atomic no.=16
Cathode rays are:
a) alpha particles b) electrons c) neutrons d) protons
what are canal rays ?
what is the difference between sodium ion and sodium atom ?
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 ?
Why is the relative mass of electron is taken as negligible?
the properties of electrons, protons and neutrons.
Why is a alpha particle called helium nucleus?
what are the application of isotopes
What happens when an electron jumps from lower to higher energy levels?
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 ?
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
difference between electrons protons and neutrons...also find the relation between the three
how is hydrogen and helium supposed to be two different isotones as hydrogen does not have neutrons
Who discovered proton? Golstein or Rutherford?
1.If the number of molecules in a given sample of SO2 is 3.011 x10 23
Calculate the following:
a) Number of moles in the given sample
b) Mass of SO2 in the sample
c) Number of oxygen atoms in the sample
Q1 Tabulate name of elements,their latin names and symbols.
explain the rutherford's gold foil experiment with the help of diagram?
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.
why is the valency of phosphorus 3 & 5 both ?
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 are sub shells ?? Who discovered them and how ??? the discoverer of sub shells disproved which scientist
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 .........
Q :If number of electrons in an atom is 8 and number of protons is also 8, then (i) what is the atomic number of the atom and (ii) what is the charge on the atom?
ANS:(i) The atomic number is equal to the number of protons. Therefore, the atomic number of the atom is 8.
(ii) Since the number of both electrons and protons is equal, therefore, the charge on the atom is 0.
My Q: Why is the charge on the atom 0????
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
1. Calculate the number of moles present in 23 g of sodium. (Atomic mass of sodium = 23)
discovery of electrons
a)no. of grams-atoms of oxygen ?
b)the no. of atoms of oxygen
c)the no. of molecules of ozone in 32g of ozone (O3)
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.
an ion M3+ contains 10 electrons and 14 neutrons.What are the atomic mass and mass number of the element M ? name the element
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
Why do like charges repel and how does unlike charges attract each other
State two main postulates of Thomson model of an atom
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:
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.
what is difference between Isotopes, Isobars and Isotones
State any four general characteristics of isotopes.
give the atomic masses of important element for class 9
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
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.
what is the atomicity of ammonia
difference between isotope and isobars
what is an atom ?
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
How to calculate number of electron,proton,neutron ?
who discovered the proton? E. goldstein or rutherford?
Z = 3, what would be the valency of the element? Also, name
write three significant features of Bohr's model of an atom.
write a short note on the DISCOVERY OF NEUTRONS.
Name three feature of rutherford's model
from the symbol 32S16 state:-
i)atomic number of sulphur
ii) mass number of sulphur
iii) electronic configuration of sulphur.
what are cathode rays and anode rays?
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