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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Answered by
1
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 Number
10 = Mass number - 9
Mass number = 10 + 9 = 19
Correct option is (b).
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Answered by
0
Hey mate
your answer is option B
19.
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