Periodic Table Lesson

Proton

Neutron

Electron

Molecule

Electron

Proton

Neutron

Photon

They are found in the outermost shell of an atom.

They determine the element's reactivity.

They are always paired.

They participate in forming chemical bonds.

Low melting point

Shiny luster

Good conductor of electricity

High density

No luster (dull appearance)

Good conductor of heat and electricity

Brittle (breaks easily)

Low density

Shiny new Yeti cup

Carbon in your pencil lead

Silicon used in microprocessors in cell phones

Helium in a balloon

Periods are columns numbered from 1-18.

Periods are rows numbered from 1-7.

Elements in the same period have similar chemical properties.

Atomic number decreases from left to right.

Group 1

Group 2

Group 17

Group 18

Alkali metals

Noble Gas family

Carbon family

Transition metals

They have the same number of valence electrons.

They have the same atomic mass.

They have the same number of protons.

They have the same number of neutrons.

The number of protons in the nucleus

The number of neutrons in the nucleus

The number of valence electrons

The atomic mass

They have a full outer energy level of electrons.

They are usually found in Group 8A of the periodic table.

They are highly reactive with other atoms.

Helium is an exception as it is stable with only two valence electrons.

It needs to lose electrons to become stable.

It needs to gain one electron to fill its outer shell.

It needs to share electrons so both atoms have two electrons in their outer shell.

It needs to have eight electrons in its outer shell.

Because its structure resembles Mickey Mouse's head and ears

Because it is found in Disneyland

Because it is a cartoon molecule

Because it is unstable

He arranged elements by atomic number, which revealed repeating patterns in properties.

He grouped elements by color, which made the table visually appealing.

He organized elements alphabetically, making them easier to find.

He listed elements by their melting points, which helped in industrial applications.