made of atoms

Chemically bonded

Atoms must be same type only

atoms must be different type only

Elements must only be made of a type of atoms

All elements must be in atomic form

All elements must be in molecule form

Elements are usually uncharged

Made of molecules

Made of ions

Made of different types of ions with same charges

Made of same types of ions

Helium

Water

Zinc

Chlorine

Bromine

Oxygen

Nitrogen

Argon

When temperature increases, particles move slower because they expand

When temperature is constant, heavier particles will move slower

When temperature decreases, kinetic energy of particles also decreases

When temperature is constant, all particles stop moving

Bromine gas will diffuse from low concentration to high concentration

Bromine molecules will diffuse into spaces between air particles

Bromine molecules are small and discrete

Bromine molecules are constantly vibrating at their fixed position

Heat energy is absorbed

Particles can move freely

Particles will arrange less orderly

Kinetic energy of particles is higher

Temperature is decreasing

Heat energy released from forming forces of attraction is the same as heat energy lost to surrounding

There will be a mix of solid and liquid

Kinetic energy of particles decreases

Shells

electron

proton

Neutron

It is found in nucleus

Is has relative mass of 1

It is the same as number of proton

It is neutral

it has proton, neutrons and electrons

Electrons are found in shells

The number of neutron is the same as number or proton

The number of proton is the same as number of electron

It is the sum total of proton and neutron in the nucleus of an atom

It is similar to the mass of an atom

Also known as mass number

it determines how many electrons an atom has

It determines the number of electrons in an atom

It has the same value as neutron

It is the same as the atomic mass

It can be use as to find total number of neutron IF nucleon number is given