Periodic Table

He discovered all the elements in the periodic table.

He organized the first periodic table and predicted the existence of undiscovered elements.

He invented the atomic model.

He named all the elements after himself.

Increasing atomic number

Increasing atomic mass

Alphabetical order

Decreasing number of protons

They are vertical columns.

There are 18 groups in total.

Elements in a group have similar chemical properties.

Groups are arranged horizontally.

Group 1

Group 2

Group 17

Group 18

1

2

4

7

Atomic radius decreases as you move down a group.

The number of protons increases as you move to the right and down the periodic table.

Metals become less reactive as you move to the left of the periodic table.

The number of protons decreases as you move to the right of the periodic table.