Periodic table of elements

Dimitri Mandalay arrange the elements according to

Increasing atomic mass

Now the elements are arranged, according to increasing

Atomic number

Groups or families

Vertical columns of elements there are 18 groups

Elements have similar

Properties because they have the same number of valence electrons

. 🪩Periods

Horizontal rose of elements. There are seven periods

Staircase

The zigzag line that separates the metals and nonmetals

Metals

To the left of the staircase

Properties of metals

Conductors, solid, ductile, shiny,

What happens when you combine electrons chemically

You lose them

Alkaline metals

Group one

Alkali earth metals

Group 2

Transition metals

Groups 3 to 12

Nonmetals

To the right of the staircase

Properties of nonmetals

Dull brittle, poor conductors of heat and electricity

What happens when you combine nonmetals chemically?

You gain electrons

Halogens

Group 17

Noble gases

Group 18

Noble gases, outer layer are full

Therefore, they’re non-reactive

Metalloids

Elements touching the staircase, except for aluminum they have properties of both metals and nonmetals

Coefficient

The big number in front of the molecule tells the number of molecules

Subscript

The small number after each atom tells the number of atoms written before it