Dead plants and animals become broken down in the soil Bright lights given off by decaying plants Bad smells given off by decaying plants A change in a nucleus to make it more stable
Always very noisy Always happening at the same time of the day A random process No longer happening
Alpha, beta and gamma Alpha, beta and delta Alpha, delta and gamma Hot, cold and energetic
The number of atoms in 1g of carbon The number of atoms in a nuclear reactor The number of neutrons in an atom The number of protons in an atom
The amount of atoms in 1g of carbon The weight of atoms in 1g of carbon The number of protons + neutrons in an atom The number of protons + electrons in an atom
Always radioactive substances Never radioactive substances Atoms of the same element with different numbers of neutrons Atoms of the same element with different numbers of protons
A radioactive nucleus A radioactive electron A red hot rock A blue cold rock