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Number of valence electrons in O^(2-) i...

Number of valence electrons in `O^(2-) ` is :

A

6

B

8

C

10

D

4

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ICSE-ATOMIC STRUCTURE AND CHEMICAL BONDING-EXERCISE 4(C)
  1. Why do overset(35)underset(17)" " CI and overset(37)underset(17)" " CI...

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  2. Explain fractional atomic mass. What is the fractional mass of chlorin...

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  3. What is meant by "atomic number of an element"?

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  4. Write down the electronic configuration of (i) chlorine atom (ii) chlo...

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  5. Name the following An element which does not contain any neutron

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  6. Name the following: An element having valency 'zero'.

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  7. Name the following: Metal with valency 2.

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  8. Name the following: Two atoms having the same number of protons and...

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  9. Name the following: The shell closest to the nucleus of an atom.

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  10. Give reasons Physical properties of isotopes are different

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  11. Give reasons Argon does not react.

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  12. Give reasons Actual atomic mass is greater than mass number.

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  13. Give reasons overset(35)underset(17)" " CI and overset(37)underset(1...

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  14. An element A atomic number 7 mass number 14 B electronic configura...

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  15. Rutherford's alpha-particle scattering experiment discovered

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  16. Number of valence electrons in O^(2-) is :

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  17. Which of the following is the correct electronic configuration of pota...

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  18. The mass number of an atom whose unipositive ion has 10 electrons and ...

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  19. Explain : octet rule for formation of a chemical compund.

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  20. Explain : duplet rule for formation of hydrogen.

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