Question

francium is in period 7 and group 1 and has an atomic number of 87 and an atomic mass of 87.

1. choose the best answer.

how many valence electrons does francium have?
○ 1
○ 7
○ 223
○ 87

1. choose the best answer.

how many total electrons does francium have?
○ 1
○ 7
○ 223
○ 87

1. choose the best answer.

how many energy levels does francium have?
○ 223
○ 1
○ 7
○ 87

Explanation:

1. For valence electrons: Group 1 elements have 1 valence electron.
2. For total electrons: In neutral atoms, total electrons equal atomic number (87).
3. For energy levels: The period number equals the number of occupied energy levels (7).

Answer:

1. 1
2. 87
3. 7