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 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.

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 ?

difference between electrons protons and neutrons...also find the relation between the three

 Who discovered proton? Golstein or Rutherford?