Question

An element X has atomic number 17. -
(a) To which period of the modern periodic table will it belong?
(b) What is the valency of the element?
(c) Write the formula of the compound formed when it combines with sodium?
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Answer 1

Answer:

a) Period no. 3

b) The valency of the element is 1.

c) When it will combine with sodium, it will form NaCl