S3 Challenge (4) Groups and Periods

The period number of an element refers to

• the number of electrons present in an atom of that element.

• the number of outermost shell electrons present in an atom of that element.

• the number of protons present in an atom of that element.

• the number of occupied electron shells present in an atom of that element.

The group number of an element refers to

• the number of electrons present in an atom of that element.

• the number of outermost shell electrons present in an atom of that element.

• the number of protons present in an atom of that element.

• the number of occupied electron shells present in an atom of that element.

Elements in the same group should have

• similar chemical properties.

• similar physical properties.

• similar colours.

• similar masses.

Elements in the same group should have the same

• number of protons in their atoms.

• atomic numbers in their atoms.

• number of outermost shell electrons in their atoms.

• atomic sizes in their atoms.

The specific name of Group I elements is

• alkali metals.

• alkaline earth metals.

• halogens.

• noble gases.

The specific name of Group II elements is

• alkali metals.

• alkaline earth metals.

• halogens.

• noble gases.

The specific name of Group VII elements is

• alkali metals.

• alkaline earth metals.

• halogens.

• noble gases.

The specific name of Group 0 elements is

• alkali metals.

• alkaline earth metals.

• halogens.

• noble gases.

The reactivities of Group I elements ______ down the group.

• increases

• decreases

• are the same

The reactivities of Group II elements ______ down the group.

• increases

• decreases

• are the same