Question

1. how are the terms group period used on the periodic table?

Explanation:

In the periodic table, a group is a vertical column. Elements in the same group have the same number of valence electrons, leading to similar chemical properties (e.g., Group 1: alkali metals, Group 17: halogens). A period is a horizontal row. Elements in the same period have electrons filling the same principal energy level (e.g., Period 1 has 1 energy level, Period 2 has 2, etc.), and properties change across a period (e.g., from metals to non - metals).

Answer:

• Group: Vertical columns in the periodic table. Elements in the same group have the same number of valence electrons, resulting in similar chemical properties.
• Period: Horizontal rows in the periodic table. Elements in the same period have electrons filling the same principal energy level, and their properties change across the row (e.g., from metallic to non - metallic character).