Question

The element with atomic number 15 belongs to which period of the long form of the

periodic table?​

Answer 1

It belongs to the third period of the periodic table.

Explanation:

• In the modern periodic table, there are two types of rows.
• The horizontal rows are called periods and the vertical rows re known s groups.
• There are 7 periods and 18 groups in the periodic table.
• The element with atomic number 15 has the electron configuration as.
• 1s^2, 2s^2,2p^6, 3s^2, 3p^3
• It belongs to the third period of the periodic table.