Where about in the atom is the nucleus positioned?
Centre of the nucleus/ middle
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What does the nucleus contain?
Protons and neutrons
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Which points best explain what the electrons are?
They have a negative charge. They have virtually no mass. They occupy shells (energy levelaround the nucleus. Electrons follow the configuration 2,8,8.
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The mass number is?
The total number of electrons and proton in an atom.
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What is the atomic number?
The number of protons and electrons.
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The Mass number - atomic number =
The number of neutrons.
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What is an element made up of?
An element is made up of just one type of atom
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Name one thing you cannot do with an element?
You can’t convert one type of element into another using chemical reactions.
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What is an isotope?
ifferent atomic forms of the same element, which have the same number of protons but different numbers of neutrons.
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What would happen if isotopes had a different number of protons?
If they had a different number of protons, they’d be different elements altogether.
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Name a popular set of isotopes
carbon 12 and Carbon 14
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Define relative abundance
Relative abundance just means how much there is of each isotope compared to the total amount of the element in the world.
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How do you work out the Ar?
*** of each isotope by its relative abundance. Add those together. Divide by 100
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