Atoms

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Atoms

Mainly empty space

Simplest is hydrogen

3 isotopes

tritium

Radioactive

1 proton, 1 electron, 2 neutrons

deuterium

1 proton, 1 electron, 1 neutron

protium

1 proton, 1 electron

Isotopes

Many are radioactive

Unstable, decay

Element with largest number f isotopes is tin, with 10

Same proton number; varying numbers of neutrons

shells

Charge clouds

electrons

Negatively charged

Negligible mass

Negatively charge

Nucleus

Minute volume within atom (1/15,000)

nucleons

neutrons

protons

Relative mass = 1

positive charge

Proton number

Element

26 artificial

Heaviest is ununoctium

Atomic number 118

Mass number 294

created in nuclear reactors

radioactive

92 Naturally-occurring

Largest naturally occurring is Uranium

Atomic number 92

Mass number 238

Periodic Table

Atomic number