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Nuclear charge of an element B is twice ...

Nuclear charge of an element B is twice that of A. If A has two completely filled orbits and L shell is its outermost orbit, find out atomic numbers of A and B.

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(a) Calculation of number of electrons in first two shells
(b) Calculation of atomic number of A
(c) Calculation of atomic number of B from A
(d) 10 and 20
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