Question

3
The following table shows the position of five elements A, B, C, D and Ein
the modern periodic table.
16
1
13
14
17
2
15
18
3 to 12
Group>
Period
B
C С
2
А
ID
E
3
Answer the following giving reasons:
(i) Name the element which is a non-metal with valency three.
(ii) Name the element which forms only covalent compounds.
(iii) Compare the atomic size of A, B and C.​

Answer 1

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