Question

(1) Which of these elements belong to the third period?
A) beryllium B) calcium C) silicon D) scandium​

Answer 1

Answer:

C) silicon

Step-by-step explanation:

I think it will help you

Answer 2

Answer:

Ok I will tell you

Step-by-step explanation:

Its answer is c) Silicon

Because in third period Their are 8 elements names as sodium, magnesium, aluminium, silicon, phosphorus,sulfur, chlorine and argon