Question

12. Number of elements present in period - 2 of the long form
of periodic Table​

Answer 1

Answer:

carbon(c)

Explanation:

period no.2 and group no.14

Answer 2

Answer:

A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.