Question

Five atoms are labelled A to E.
A
Atoms
Mass No
Atomic No.
А
40
20
B
19
9
С
7
3
D
16
8
E
14
7
(a) Which one of these atoms :
(i) contains 7 protons
(ii) has electronic configuration 2, 7.
(b) Write down the formula of the compound formed
between C and D.
(c) Predict : (i) metals (ii) non-metals.
the Mchell
.​

Answer 1

Answer:

a) i) E

ii) B

b) Li2 O

c) i) A-calcium

C- Lithium

ii) B- fluorine

D- Oxygen

E- nitrogen