Question

the element of a period of the periodic table are given below in order from left to right with one of its element missing and Na mg al si s cl AR (1) to which period do that elements belong
(2) one element of this period is missing which is the missing element and where should it be placed?
(3) which one of these element is least reactive?
(4) identify the halogen from this period​

Answer 1

Answer:

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