Question

12.
1
A, B and C are three elements with atomic numbers 9, 10 and 11
respectively. Identify the groups to which the element A and C belong:
(a) halogen and alkali metal (b) alkali metal and halogen
(c) halogen and non-metal (d) metalloid and alkali metal​

Answer 1

Answer:

The answer will be of this question is option a. Halogen and alkali metal

Answer 2

Element A belong to Halogen whereas element C belong to alkali metals

Explanation:

Given:

Atomic number of three elements as:

A = 9

B = 10

C = 11

To find:

Group to which element A and C belong to?

Explanation:

• As per the given atomic numbers, the elements are identified as follows:

A - Fluorine

B - Neon

C - Sodium

• The group to which the given elements belongs are as follows:

1. Element A Fluorine belongs to group 17 which is called as halogens.

2. Element B Neon belongs to group 17 which is called as halogens.

3. Element C sodium belongs to group 1 which is called alkali metals.

• Thus it is inferred that elements A and B belong to halogen and alkali metals.
• Thus option (a) is considered as the correct answer for the given question.

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