Question

What is common about the elements of a period? Select all that apply. They have the same number of electron energy levels. They have similar chemical characteristics. They have similar physical characteristics. They transition from a metal to noble gas.

Answer 1

They have the same number of electron energy levels.

They transition from a metal to noble gas.

Step-by-step explanation:

Periods in the periodic table of elements refer to elements in the same row. All the elements in a certain row of the periodic table;

have the same number of electron energy levels.

transition from a metal to noble gas.