the smallest part of a substance that can exist independently

the smaller number that tells us how many protons every atom of that element has

Is at the bottom of each element it shows the total number of protons and neutrons in an atom of that element.

occurs when an atom loses electrons and another atom gains electrons in order to achieve a full outer shell. When Atoms lose or gain electrons they become ions.

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Chemistry

JC Science

Term	Definition
Atom	the smallest part of a substance that can exist independently
Atomic Number	the smaller number that tells us how many protons every atom of that element has
Mass Number	Is at the bottom of each element it shows the total number of protons and neutrons in an atom of that element.
Ionic Bonding	occurs when an atom loses electrons and another atom gains electrons in order to achieve a full outer shell. When Atoms lose or gain electrons they become ions.