Element Patterns- Reactive And Unreactive

Question 1

What are the vertical columns in the periodic table called?

Answer 1

Groups.

Question 2

What does the group number tell you?

Answer 2

How many outer electrons the atom has.

Question 3

In the atom, what determines how an element reacts?

Answer 3

The number of outer electrons.

Question 4

The periodic table lists all the known elements by increasing proton number.
What are the horizontal rows called?

Answer 4

Periods.