An element has its electronic configuration as 2, 8, 2. Now answer the following questions :(a) What is the atomic number of this element ?(b) To which period does this element belong ?

Q.2 (B)(ii) An element has its electronic configuration as 2, 8, 2. Now answer the following questions :
(a) What is the atomic number of this element ?
(b) To which period does this element belong ?

Doubtly Asked 25 Oct 2026 ssc 10th Save WhatsApp Report

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Answer: (a) 12; (b) period 3.

(a) The atomic number is the total number of electrons in a neutral atom: 2 + 8 + 2 = 12. The element is magnesium.

(b) The electrons are filled in three shells (K, L and M), so the element belongs to the third period of the modern periodic table. Its two valence electrons place it in group 2.

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report

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An element has its electronic configuration as 2, 8, 2. Now answer the following questions :(a) What is the atomic number of this element ?(b) To which period does this element belong ?

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