PDF chapter test TRY NOW
Write a short answer to the following questions in a few sentences:
1. Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies
Element A; Valence electroons 3; Group number 13; Valency .
Element B; Valence electroons 4; Group number 14; Valency .
Element C; Valence electroons 2; Group number 2; Valency .
Element B; Valence electroons 4; Group number 14; Valency .
Element C; Valence electroons 2; Group number 2; Valency .
2. Identify and name the metals out of the following elements whose electronic configurations are given below.
(a) 2, 8, 2 (b) 2, 8. 1
(c) 2.8. 7 (d) 2. 1
(a) 2, 8, 2 (b) 2, 8. 1
(c) 2.8. 7 (d) 2. 1
Metals are (a). , (b). Sodium and (d). as they have 1 to 3 valence electrons. Whereas, (c). is a non-metal.
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