4.1.1.5 - Size and mass of atoms

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5 Terms

1
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What is the radium of an atom?

Radius of 0.1nm ( 1 × 10 to the power of -10 metres)

2
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How do you convert from metres to nano metres?

x 10 to the power of 9

3
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How much smaller is the radius of the nucleus compared to the radius of an atom?

less than 1/10000 - so the radius of a nucleus is roughly 1 × 10 to the power of -14 metres

4
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What is meant by mass number?

Sum of protons and neutrons

5
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What is an isotope?

When atoms of the same element have the same number of protons, but a different number of neutrons