- Every atom of a given element has the same number of protons as any other atom of the same element.
atomic number (Z) - the amount of protons in the nucleus eg. Z = 6 for every carbon atom, Z = 92 for every uranium atom
isotopes - atoms with the same number of protons and different numbers of neutrons
nucleon number (A) - the total number of protons and neutrons
- We label the isotopes of an element according to their atomic number Z, their mass number A and the chemical symbol of the element:
- Z is at the bottom left of the element symbol and gives the number of protons in the nucleus.
- A is at the top left of the element symbol and gives the number of protons and neutrons in the nucleus.
- The number of neutrons in the nucleus = A - Z.
nuclides - different types of nuclei
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