How can you calculate he number of neutrons in an atom?
Subtract the atomic mass from the atomic number
Where does the mass of the atom come from?
the sum of the protons and neutrons
What is a half- life?
The time it takes for half of the radioactive atoms in a rock or bone to change into another element
the number of protons in an atom (and the number of electrons)
the sum of the protons and neutrons of an atom
are atoms of the same element that have diffrent numbersof neutrons
Average atomic number
the weighted average mass of the mixture of an element's isotopes