Question

1. what does the period tell you?

Explanation:

In the context of the periodic table (a key concept in Chemistry, a subfield of Natural Science), the period (horizontal row) of an element tells us the number of electron shells (energy levels) that the atoms of that element have. For example, elements in Period 1 have 1 electron shell, Period 2 elements have 2 electron shells, and so on. This is a fundamental concept in understanding the electronic structure and properties of elements as we move across a period (where properties change in a periodic manner) or down a group (where properties show more similarity due to the same number of valence electrons).

Answer:

In the periodic table, the period (horizontal row) of an element indicates the number of electron shells (energy levels) that the atoms of that element possess.