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15 cards from this deck
Protons, neutrons, electrons
+1 charge, mass of 1
No charge (neutral), mass of 1
-1 charge, very little mass
Nucleus (centre of atom)
Shells/energy levels around nucleus
Total number of protons + neutrons
Number of protons only
1×10−101 \times 10^{-10}1×10−10 metres (0.1 nanometres)
Less than 1/10000th the size of atom
In the nucleus
Atoms of same element with different neutrons
Same number of protons (atomic number)
Different neutrons, different mass numbers
Average mass of all isotopes of an element
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