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Elements and Compounds


7. 

In the modern periodic table, elements are classified on the basis of

Answer : A. atomic number

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8. 

The element used in lead pencils is

Answer : A. carbon

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9. 

Mass number of an element represents

Answer : A. Number of protons and neutrons

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10. 

"The properties of elements are periodic function of their atomic weights" This statement was given by

Answer : C. Mendeleef

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11. 

Which is neither an element nor a compound?

Answer : D. glucose

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12. 

An element has atomic weight 24 and equivalent weight 11.9. Its valency is

Answer : B. 2

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