Question

The position of three elements A, B and C in the Modern periodic table is

as follows :

Group

→

Period

↓

1 2 13 14 15 16 17 18

1 B



2 A

3 C

(a) Write formula of compound formed between :

(i) B and A ;

(ii) B and C

(b) Is any of the three elements a metal ? Give reason to justify your

answer.​

Answer 1

Answer:

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Explanation:

belongs to group 17. There are 7 electrons in its valance shell. Therefore it tend to accept one electron to complete octet. Hence, it is a non-metal.

(b) C is less reactive than A. As both elements belong to same group and going down to group size of element increases. A is a smaller than C therefore the cloud of electron density surrounding the nucleus is more compact. The stability of completing the octet for A is greater than for C as A is more keen to obtain an electron than C.

(c) C is smaller than B. C and B belongs to same period. Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.

(d) A will form anion A

−

. A belongs to group 17. There are 7 electrons in its valance shell. Therefore it tend to accept one electron to complete octet and forms anion.