Correct the mistakes, if any in the following statement.
i) Second period is a short period. It contains only two elements.
ii) Group $18$ elements are called Halogen family.

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Solution

i) First period is a shortest period. It contains only two elements (or) second period is a short period. It contains eight elements.
ii) Group $18$ elements are called noble gases or inert gases (or)
Group $17$ elements are called halogen family

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What is the electronic configuration of the second element in the halogen family of the second period?

	DOWN		ACROSS
a.	vertical columns are called_______	a.	horizontal rows are called_________
b.	second group elements are named __________earth metals.	b.	first group elements are called________
c.	an inert gas used in advertisement bulbs.	c.	group 17 elements are called__________
d.	a yellowish shining metal weighed in carats.	d.	group 18 elements are called__________
		e.	belongs to halogen family and helps in thyroid treatment
		f.	inner transition elements present in the 7th period

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