Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 34

1. Electrons revolve around the nucleus with Tremendous _____________ in their definite energy levels.


2. Allah has created this universe from some ____________ called elements


3. ______________ was Italian scientist who determined the correct atomic masses of element


4. Lothar Meyer's graph included about _____________ elements


5. Properties of elements are a _______________ of their atomic masses


6. _________________ are the atoms of the same element with different atomic masses.


7. _________________ of atoms play an important role in the arrangement of modern periodic table


8. Elements in the periodic table have been arranged in_____________ of their atomic number


9. ______________ arrangement of elements constitute a group


10. Seventh period is incomplete and contains_____________ elements


11. Periodic table has been divided into _____________ blocks


12. S and P-block elements are called _______________.


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