Which statement OR statements are true about groups on the periodic table?

Elements in the same group have similar properties and react the same

Elements in the same group have the same number of energy levels

Groups are also called families

Elements in the same group have the same number of valence electrons

A,C,D

Explanation:

Element in the same group shared similar chemical behaviour and resemble each other because of the same number of valency electron they have. Example group one element have a valence electron of one.

Because of the same Valency electron they react in a similar way.

Example Group 1 have one valence electron and therefore Ionize readily to form positive electron this occur when they donate their valence electron leading to the formation of electrovalent compounds this is applicable for all group one element. Hence,

Elements in the same group have similar properties and react the same

Also, because element in the same group share the same property in chemical behaviour they are said to belong to one family.

Element in the same group do not have the same energy level because their electron tends to increases down the group and therefore energy level increases and not constant for all elements.

Option A,C and D.

Explanation:

Groups on the periodic table refer to elements on the same column on the table.

Elements on the groups in periodic tables have similar physical and chemical properties and similar electronic configurations.

Elements in the same group on the periodic table have the same number of electrons at their outer shell.

Groups are also called families. Because they have the same chemical properties.

The major groups on the periodic table are;

Group 1: Alkali metals like Sodium, calcium.

Group 2. Alkali Earth metals.

Group 11: coinage metals.

Group 15: Pnictogens.

Group 16: Chalcogens.

Group: 17: halogens like chlorine, flourine. Bromine.

Group 18: Noble gases like Argon, neon