Answer:
Isoelectronicity may be used to predict the properties and reactions of a species. It is used to identify hydrogen-like atoms, which have one valence electron and are thus isoelectronic to hydrogen.
Explanation:
Answer:
1 because the last one is 1 and the previous shell was complete.
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Answer: The formula of the hydrated alumina is 
Explanation:
Decomposition of hydrated alumina is given by:

Molar mass of
= 101.96 g/mol
According to stoichiometry:
(101.96+18x) g of
decomposes to give 101.96 g of
Thus 5.000 g of
decomposes to give=
of H_2O
But it is given 5.000 g of a sample of hydrated salt
was found to contain 2.6763 g of unhydrated salt
Thus we can equate the two equations:


Thus the formula of the hydrated alumina is 
Answer: option A, J, K, N, O
Explanation: