Which nonmetal is the "wrong" place on the periodic table?

The correct answer is: Hydrogen

Explanation:

The periodic table is defined as the tabular arrangement and classification of the chemical elements. This table contains seven rows, called periods; and eighteen columns, called groups.

Generally, the metals are present on the left and the non-metals are present on the right of the periodic table.

However, Hydrogen (atomic number 1) is the only non-metal that is placed in group 1, on the left-side of the periodic table. This is because according to the electronic configuration of hydrogen (1s¹), it should be placed in group 1 of the periodic table.

it's c. elements are placed in rows based on how may valencies electrons have.