Question

what can be said of all elements in group 1?
○ they have 1 valence electron
○ they are metals

Explanation:

Group 1 elements in the periodic table (alkali metals) all have 1 valence electron. While most are metals, hydrogen (in group 1) is non - metal, so "They have 1 valence electron" is a property true for all group 1 elements.

Answer:

A. They have 1 valence electron