Question

7. An element X has atomic number 11, it belongs to which period of modern periodic table? a. 1 b. 2 c. 3 d. 4.​

Answer 1

Answer:

d

Explanation:

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Answer 2

$\huge\sf\underline\red{Answer}$

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THE ELEMENT IS SODIUM BECAUSE IT HAS 1 valency AND ELECTRONIC CONFIGURATION IS 2,8,1 .THE NUMBER OF PROTONS IS 11 .

IT BELONGS TO 3RD PERIOD OF MODERN PERIODIC TABLE.

(option c)

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