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Elements and Compounds


19. 

Consider the following statements with reference to the Periodic table of chemical elements
1) Ionisation potential gradually decreases along a period
2) In a group of elements, electron affinity decreases as the atomic weight increases.
3) In given period, electronegativity decreases as the atomic number increases.
Which of the statements are correct?

Answer : B. 2 only

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20. 

Two of the most common elements in the earth's crust would include

Answer : D. silicon and oxygen

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21. 

The element named after sun is

Answer : C. Helium

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22. 

An element with atomic number 7 will contain

Answer : D. 7 electrons and 7 protons

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23. 

The valency of helium is

Answer : A. 0

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24. 

Equivalent mass X___________= Atomic mass

Answer : B. Valency

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