Question

1. which elements had only one valence electron? give the name and symbol for each.

what do you notice about location of these elements?

Explanation:

Step1: Recall periodic - table trends

Elements in group 1 of the periodic table have 1 valence electron.

Step2: List group - 1 elements

Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr).

Step3: Observe location

These elements are in group 1 of the periodic table.

Answer:

Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr); They are in group 1 of the periodic table.