Question

1. explain the difference between \groups\ and \periods\ in the periodic table.

*please include how many groups there are and how many periods there are in the table.

Explanation:

Groups are vertical columns in the periodic table. Elements in the same group have similar chemical properties as they have the same number of valence electrons. There are 18 groups in the periodic table. Periods are horizontal rows. As we move across a period from left - to - right, the number of protons (atomic number) increases by one for each element. There are 7 periods in the periodic table.

Answer:

Groups are vertical columns (18 in total) with similar chemical properties (same valence electrons). Periods are horizontal rows (7 in total) with increasing atomic number across.