Question

The atomic number of five elements A,B,C,D and E are given on the next page ---
Element Atomic number
A 4
B 10
C 11
D 15
E 17
(a) which of these elements are metals?
(b) which of these elements are non - metals?
(c) which element has 2 valence electrons?​

Answer 1

Answer:

1.(a)= 4 and 11 are metal

2.(b)= 17 is non metal

3.(c)= 10 and 15 are 2 valence electrons.

Explanation:

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Answer 2

Answer:

A(Boron),B(Neon),D(phosphorus),E(chlorine) are non metals and c(sodium) is a metal