Question

sr atom sr ion +1 +2 +3 -1 -2 -3

Explanation:

Step1: Determine the valence electrons of Sr

Strontium (Sr) is in Group 2 of the periodic table. Elements in Group 2 have 2 valence electrons.

Step2: Analyze the ion formation

Atoms tend to lose or gain electrons to achieve a stable electron configuration (usually 8 valence electrons). Since Sr has 2 valence electrons, it will lose 2 electrons to form a cation. When an atom loses electrons, it has a positive charge equal to the number of electrons lost.

Answer:

The charge of the Sr atom is \(0\) (neutral atom). The charge of the Sr ion is \(+ 2\) (because it loses 2 electrons).