Atoms

Particle that has a positive charge

Center of an atom. Made up of protons and neutrons held together my invisible forces

Particle that has a neutral charge

Particals that surrounds the nucleus. Has a negative charge

Place around that atom where electrons that can be found

Found at outermost shell. Determines the atoms chemical properties.

States that the physical and chemical properties are affected by the amount of electrons protons and neutrons

Left to right on the periodic table Father left you go the more protons an element has

Up and down on the periodic table

Makes up most of periodic table

Most of right side. Mostly noble gases and halogens

Have characteristics of non metals and metals

First group are alkali metals except hydrogen

Second group.

Group 3 to 12

Group 17

Group 18 Not reactive

Atom that has lost or gained an Electron

Number of protons and electrons

It’s average atomic mass

Atom that has same amount of protons but different amount of neutrons

Unit of mass that describes atom or molecule

Average mass of natural isotopes

Si unit for counting atoms and partials