Question

Elements in the periodic table are placed in groups 1-18 based on *

O similar atomic mass
O number of energy levels
O similar chemical properties
O none of the above

Answer 1

Elements are arranged in groups 1-18 on the periodic table based on their similar chemical properties, with each group containing elements with the same valence electron configuration. Therefore correct option is C

Step-by-step explanation:

Elements in the periodic table are placed in groups 1-18 based on their similar chemical properties. This organization allows chemists to make general statements about the properties of the elements within a group.

For instance, Group 1 contains the alkali metals, Group 2 includes the alkaline earth metals, Group 17 consists of the halogens, and Group 18 is made up of the noble gases.

Elements within the same group have the same number and distribution of electrons in their valence shells, leading to their similar chemical behaviors.