Question

In the following table, seven elements A, B, C, D, E, F and G (here letters are not the
usual symbols of the element) of the modern periodic table with their atomic numbers are
given.
Atomic
3
5 6
7. 8
9
10
numbers
E
A
11
G
18
12
13
14
15
16
17
Atomic
numbers
B
с
D
F
a) What is the valency of element 'A'?
b) Which of these is a halogen?
c) Which of these are elements?
d) Among elements 'A' and 'B' which element has smaller atomic radius?
e) Write the electronic configuration of C and E.​

Answer 1

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