If period number and group number of any representative element(s) are same then which of the following statement is incorrect regarding such type element(s) in their ground state? (Period number and

Question

If period number and group number of any representative element(s) are same then which of the following statement is incorrect regarding such type element(s) in their ground state? (Period number and group number are according to modern form of periodic table)

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: An element with 9 protons has an atomic number of Z=9, which is Fluorine (F). Step 2: Determine its ground state electronic configuration: 1s2 2s2 2p5 (or 2, 7 in shells). Step 3: Fluorine has 7 valence electrons and needs 1 electron to complete its octet and achieve stable noble gas configuration. Its combining capacity, or valency, is therefore 1.

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