Groups vs. Periods

These elements are in a:

• group

• period

These elements are in a:

• group

• period

Which elements have 1 electron in their outermost shell?

• period 1

• group 1

Which elements have 2 electronic shells?

• period 2

• group 2

Which elements have 4 electrons in their outermost shells?

• group 1

• group 4

• group 8

Periods in the periodic table tell us_.

• the number of electrons in the last electronic shells

• the number of protons

• the number of energy levels

• the total number of subatomic particles in the element's atom

Groups in the periodic table tell us_.

• the number of energy levels (rings)

• the number of protons

• the number of neutrons

• the number of electrons in the last shell

Up and Down columns in the periodic table are

• Groups

• Periods

Left to right rows in the periodic table are _.

• Groups

• Periods

Which period is Oxygen (atomic number = 8) found in?

• Period 1

• Period 2

• Period 3

• Group 4