Determine atomic number and neutrons of an element, Chemistry

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An element have atomic weight 40 and it's electronic configuration is 1s², 2s², 2p⁶, 3s², 3p⁶. Then its atomic number and number of neutrons will be:

(1) 18 and 22

(2) 22 and 18

(3) 26 and 20

(4) 40 and 18

Ans: (a)18 and 22

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