Question

Element = A, B, C, D, E
Atomic number = 7, 10, 12, 4, 19
which two element are chemical similar? Which is an inert gas? Which element belong to 3rd period of periodic table? Which element among these is a non - metal?

Answer 1

Answer:

A is nitrogen

B is neon

C is Mg

d is Be

E is potassium

3 period element = Mg is C

non metal N is A

inert gas is neon That is B