Page 59 - Understanding NCERT Science 09

18. Which one of the following is a correct electronic configuration
of sodium?
(a) 2,8 (b) 8,2,1 (c) 2,1,8 (d) 2,8,1
19. Complete the following table.

Atomic Mass Number Number Number Name of
Number Number of of of the Atomic
Neutrons Protons Electrons Species

9 - 10 - - -

16 32 - - - Sulphur

- 24 - 12 - -

- 2 - 1 - -

- 1 0 1 0 -

48 SCIENCE

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