Periodic Table

Why is the periodic table called 'periodic'?

• Because it is divided into periods of time.

• Because it is arranged in a circular pattern.

• Because it shows recurring properties of elements.

• Because it is updated periodically.

What do elements in the same period have in common?

• They have the same number of protons.

• They have the same number of energy shells.

• They have the same atomic mass.

• They have the same number of neutrons.

How many energy shells does potassium have?

• One

• Two

• Three

• Four

What do elements in the same group have in common?

• They have the same number of electrons in their outermost shell.

• They have the same number of protons.

• They have the same atomic mass.

• They have the same number of energy shells.

How many electrons are in the outermost shell of elements in group seven?

• Five

• Eight

• Six

• Seven