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the electronic configuration of an atom is K^2 L^7.if there are 10 neutrons in the atom,its mass number is options are 28,19,10 and 9 |
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Answer» No. of ELECTRONS in 'K' shell = 2 No. of electrons in 'L' shell = 7 THEREFORE, ATOMIC NUMBER = TOTAL NUMBER OF ELECTRONS = 2 + 7 = 9 No. of Neutrons = Mass Number - Atomic Number10 = Mass number - 9 Mass number = 10 + 9 = 19 Correct option is (B).HOPE IT HELPS!!!! |
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