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write 5-6 differences between isobars and isotopes in a tabular form .
how to find valency of an element?
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 were the drawbacks of thomson model of atom
what is the difference between sodium ion and sodium atom ?
Calculate the number of molecules in 8g of Oxygen ?
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
find the valency of sulphur .[atomic no.=16
'SO2 is an air pollutant released during burning of fossil fuels & from automobile exhaust'.
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 ?
the properties of electrons, protons and neutrons.
what are the application of isotopes
discrete orbits are also known as_____
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?
6. which observation of rutherfords scattering experiment established the presence large empty space in atom?
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
Q1 Tabulate name of elements,their latin names and symbols.
State any four general characteristics of isotopes.
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????
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.
In the Thomson's model of atom,which of the following statements are correct ?
1) the mass of the atom is assumed to be uniformly distributed over the atom
2) the (+) ve charge is assumed to be uniformly distributed over the atom
3) the e-s are uniformly distributed in the positively charged sphere
4) the e- s attract each other to stabilize the atom.
a) 1, 2 and 3 b) 1 and 3 c) 1 and 4 d) 1, 3 and 4
why is the valency of phosphorus 3 & 5 both ?
Why do isotopes have same chemical properties and isobars show different chemical properties?
How to learn the 30 elements of modern periodic table Quickly?
List any three distinguishing features between the models of an atom proposed by J.JThomson and Ernest Rutherford.
what is the atomicity of ammonia
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
identify the isotopes out of A,B,C and D?
33A17 , 40B20 , 37C17 , 38D19
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.
Elements A and B react to form a compound Ax and By. Elements C and D react to form another compond Cp and Dq. What will be the formula of the compound formed, when A and D react?
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 .........
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
How many atoms are present in SO4 raised to 2- ion and NH4+ ion???
discovery of electrons
the following data represents the distribution of electrons ,protons and neutrons in atoms of four elements A, B, C, D.
ELEMENTS PROTONS NEUTRONS ELECTRONS
A 19 21 19
B 17 18 17
C 17 20 17
D 18 22 18
Answer the following:
1. describe the electronic distribution in atom of element B.
2. is element B a metal or non-metal? why?
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
State two main postulates of Thomson model of an atom
A Compound XH is formed by combination of an element X with hydrogen. Find the valency of element X. State the formula of the compounds formed by combination of X with :
(a)Nitrogen (b) Oxygen
applications and examples of isotopes an isobars ?
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
what is difference between Isotopes, Isobars and Isotones
Q1.State the characteristics of nucleus of an atom?
give the atomic masses of important element for class 9
You are given an element 7X14.Find out.
a.1.number of protons,electronsneutrons in X
a.2.valency of X
a.3.electronic configuration of X.
b.If Bromine atom is available in the form of, say two isotopes
35BR79 (49.7%) 35BR82 (50.3%).
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.
which has highest e/m ratio
a) he 2+
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
what is J.J. Thomson's model of an atom?
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.
is an isotope of noble gas radon . how many protons,neutrons&electrons are present in 1 atom isotope of radon?
Name three feature of rutherford's model
what are cathode rays and anode rays?
Who proposed the existence of neutron and what was the basis of this assumption?
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