Q.7: In the potassium (_k) study the following:-

39

19

a- The electronic configuration.

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b- No. of neutrons: ---------------------------------------------------------------------

c- No. of protons: ----------------------------------------------------------------------

d- No. of electrons: --------------------------------------------------------------------

e- Atomic no.: --------------------------------------------------------------------------

f- Mass no.: -----------------------------------------------------------------------------

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Q. 8: Complete the table:

	Calcium	Sodium	Chlorine
Element symbol	Ca	-----	-----
No. of electrons	-----	11	-----
No. of protons	20	-----	17
No. of neutrons	20	12	-----
Atomic no.	-----	-----	-----
Mass no.	-----	-----	35
Electronic configuration	-----	2-8-1	-----