Question

1. choose the best answer. how do you determine the number of energy levels an element has by looking at the periodic table of elements? it is the same as the atomic mass. it is the same number as the last digit of the group number. it is the same number as the period number. it is the same as the atomic number. 8) choose the best answer. francium is in period 7 and group 1 and has an atomic number of 87. how many energy levels does francium have?

Explanation:

For question 7: The number of energy levels (electron shells) an element has corresponds directly to its period number on the periodic table.
For question 8: Francium is stated to be in period 7, and the period number equals the number of energy levels an element has.

Answer:

1. It is the same number as the period number.
2. 7