The electronic configurations of three elements A, B and C are as follows:A 2,8,1 B 2,8,7 C 2,4 (a) Which of these elements is a metal?(b) Which of these elements are non-metals?(c) Which two elements will combine to form an ionic bond?(d) Which two elements will combine to form a covalent bond?(e) Which element will form an anion of valency 1?
(a) A is a metal as it has one electron in its last shell.
(b) B and C are non-metals as they have more than 3 electrons in their outer shell.
(c) A and B combine to form an ionic bond as A donates its electron to B.
(d) B and C combine to form a covalent bond as they share electrons to form a compound.
(e) B will form an anion with valency 1 since it needs only 1 electron to complete its octet.
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