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I/GCSE Chemistry- Elements

Edexcel Chemistry Elements

· Edexcel,Elements,Periodic table,igcse chemistry,gcse chemistry

Properties🧐

Elements consist of one type of atom only.

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Quite a lot of everyday substances are elements:
Copper, Aluminium, Iron, Oxygen, Nitrogen.

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Each element has a different number of protons. It's the number of protons in an atom that decides what element it is. For example, any atom of the element helium will have 2 protons - any atom with 2 protons will be a helium atom.

Atomic Number & Mass Number

Each element has an atomic number and a mass number.

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MASS NUMBER (TOP NUMBER) - this tells you the total number of protons and neutrons in the atom.

ATOMIC NUMBER (BOTTOM NUMBER) - this tells you the number of protons in an atom (and so the number of electrons too).

Neutron Number

In I/GCSE Chemistry, you will be asked to find the number of neutrons in an atom...

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To do this, you subtract the atomic number from the mass number (bottom number from the top number).

E.g. there are 8 neutrons in an oxygen nucleus because 16-8=8.

Reference: https://lh3.googleusercontent.com/proxy/OpSkYQiE3TIZdw8e-kd7BPB4iFMNfwQNy3fee1ILyWQXouY9EexRrjyPrO6qshk7AftzKFzAqiMi8EqKzFsPNZZMmxpXkpiUnJNjj6DAIWR-SiiVWTgUewqABKs

https://www.chemistrygcse.co.uk/1%20-%20Core%20Chemistry/Atoms/protonsneutronselectrons.html

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Drafted by Catrina (Chemistry)

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