Question

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but are different in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of elements D is almost neutral.

a)Which one of the eight elements is likely to be a noble gas?

b)Which one of the eight elements would have the largest atomic radius?

c)Which two elements amongst these are likely to be non - metals?




ANSWERS

a)H

b)A

c)G




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Answer 1

Answer:

Explanation:

The elements belong to the third period of the periodic table, and have the same number of electron shells but different number of electrons in their outermost shells. ... This is because in the third period, elements A, B and C are metals, D is a metalliod, and E, F, G and H are non-metals.