Atoms

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What is the charge of an atom's nucleus and why?
A nucleus' charge is positive as it contains protons and neutrons and protons have a positive charge whilst neutrons are neutral, meaning the overall charge is positive.
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Where is the whole mass of an atom concentrated?
In it's nucleus
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Name some features of electrons.
They carry a negative charge and move around the nucleus in electron shells. They are tiny but cover a lot of space. They have virtually no mass.
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Why does the No. of protons = the No. of electrons?
The charge on electrons is the same size as the charge on protons, but opposite. This means that the number of protons always equals the number of electrons in an atom.
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Protons are..
Heavy with a relative mass of 1 and positively charged with a relative charge of +1
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Neutrons are..
Heavy with a relative mass of 1 and neutral with a relative charge of 0
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Electrons are..
Tiny with a relative mass of 1/2000 and negatively charged with a relative charge of -1
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Card 2

Front

Where is the whole mass of an atom concentrated?

Back

In it's nucleus

Card 3

Front

Name some features of electrons.

Back

Preview of the front of card 3

Card 4

Front

Why does the No. of protons = the No. of electrons?

Back

Preview of the front of card 4

Card 5

Front

Protons are..

Back

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