Question

1. what does a chemical family have in common?

Explanation:

A chemical family (or group) in the periodic table consists of elements with the same number of valence electrons. This leads to similar chemical properties, like reactivity patterns (e.g., alkali metals all have 1 valence electron, are highly reactive, and form +1 ions). Also, they often have similar physical properties trends (e.g., atomic radius, melting/boiling points) down the group.

Answer:

Elements in a chemical family (group) have the same number of valence electrons, leading to similar chemical properties (e.g., reactivity, ion formation) and often show trends in physical properties (e.g., atomic radius, melting/boiling points) down the group.