Question

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Answer 1

Explanation:

c) the 7th period is considered as the incomplete period in the periodic table

d)The horizontal rows of elements in the periodic table are known as periods

vertical columns as groups

e) when halogen react with alkali metals it yields to form halides

f) periods 6 and 7 contains inner transition metal(ITM)

g) sodium .it dissolves in water to give a strong alkali NaOH