Give scientific reason:
a. The atomic size increases down the group in the periodic table.
b. $18 t h$ group of periodic table is also called zero group.

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Solution

a. As we move down the group, the number of shells goes on adding and hence, the atomic size increases.
b. In 18th group the elements present are the inert elements having valencies zero. Hence, it is known as zero group.

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Q. Atomic size increases down the group in the periodic table.

Give scientific reasons:

1. Atomic size increases down the group.

2. Metallic character decreases from left to right in a period.

3. Elements in the same group show same valency.

(i) Electropositive nature of the element(s) increases down the group and decreases across the period
(ii) Electronegativity of the element decreases down the group and increases across the period
(iii) Atomic size increases down the group and decreases across a period (left to right)
(iv) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Which is the element with the smallest atomic size

Q. Identify the correct option regarding the trend in atomic size down the group of the periodic table.

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Give scientific reason:a. The atomic size increases down the group in the periodic table.b. 18th group of periodic table is also called zero group.

a. As we move down the group, the number of shells goes on adding and hence, the atomic size increases.b. In 18th group the elements present are the inert elements having valencies zero. Hence, it is known as zero group.

Give scientific reason:
a. The atomic size increases down the group in the periodic table.
b. $18 t h$ group of periodic table is also called zero group.

a. As we move down the group, the number of shells goes on adding and hence, the atomic size increases.
b. In 18th group the elements present are the inert elements having valencies zero. Hence, it is known as zero group.