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The electronic configurations of four el...

The electronic configurations of four element A , B , C and D are as follows.
A. 2,8,1
B. 2,8,7
C. 2,8,8
D. 2,4
(a) which of these elements is a metal ?
(b) Which of these elements are non-metals?
© 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?
(f) Which element is a noble gas ?

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