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Standard XII

Chemistry

Heat Capacity

The position ...

Question

The position of three elements $A$ , $B$ and $C$ in the Periodic Table are shown below –

Group 16 Group 17

- -

- A

- -

B C

c) Will $C$ be larger or smaller in size than $B$ ?

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Solution

$C$ is smaller in size than $B$ .
As we move from left to right across a period in periodic tabls, atomis size decreases. This is due to the addition of an extra electron in the valance shell which increases the nuclear attraction and atomic size decreases. As we move from top to bottom in a group, atomic size increases due to the addition of an extra shell.

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Heat Capacity

Standard XII Chemistry

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The position of three elements A, B and C in the Periodic Table are shown below – Group 16 Group 17 - - - A - - B C c) Will C be larger or smaller in size than B?

The position of three elements $A$ , $B$ and $C$ in the Periodic Table are shown below –

Group 16 Group 17

- -

- A

- -

B C

c) Will $C$ be larger or smaller in size than $B$ ?