Give reason as to why:

The oxidising power of element increases on moving from left to right along a period in the period in the periodic table.

Fill in the blanks from the choices given below:

Across a period, the ionisation potential …………….(increases, decreases, remains same)

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Down the group, electron affinity…………….(increases, decreases, remains same).

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In the periodic table alkali, metals are placed in the group..........

• 1

• 11

• 17

• 18

Choose the correct answer from the options given below:

Which of the following properties do not match with elements of the halogen family?

• They have seven electrons in their valence shell.

• They  are highly reactive chemically.

• They are metallic in nature.

• They are diatomic in their molecular form.