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Definition
| An element with the same number of protons and neutrons. |
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Term
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Definition
| An atom that has lost or gained electrons. |
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Term
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Definition
| An atom that has lost electrons. |
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Term
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Definition
| An atom that has gained electrons. |
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Term
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Definition
| Atoms of elements that have different numbers of neutrons, but the same number of protons. |
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Term
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Definition
| A sub-atomic particle found in the nucleus with a positive charge and a mass of 1 |
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Term
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Definition
| A sub-atomic particle found in the nucleus with no charge and a mass of 1 |
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Term
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Definition
| A sub-atomic particle found surrounding the nucleus with a negative charge and no mass. |
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Term
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Definition
| The centre of the atom, it contains protons and neutrons. |
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Term
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Definition
| These surround the nucleus and hold the electrons. Electrons are always held in the lowest possible arrangement. |
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Term
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Definition
| Is closest to the nucleus and can hold up to 2 electrons. |
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Term
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Definition
Can hold up to 8 electrons.
Will only hold electrons after the 1st shell is full. |
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Term
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Definition
Can hold up to 8 electrons.
Will only hold electrons after the 1st and 2nd shells are full. |
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Term
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Definition
Is the number of protons in the atom.
This is also the same as the number of electrons in a neutral atom. |
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Term
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Definition
| Is the number of protons and neutrons in the atom. |
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Term
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Definition
| Neutrons = atomic mass - atomic number |
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Term
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Definition
| Contain only one type of atom, there are approximately 110 elements and we locate them on the Periodic Table. |
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Term
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Definition
| Contain 2 or more different elements CHEMICALLY joined together. |
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Term
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Definition
| Contains 2 or more different substances (elements or compounds) in the same space, they are NOT chemically joined together, they are easy to separate. |
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Term
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Definition
| A compound containing positive metal and negative non-metal ions that are held together by opposite forces of attraction. |
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Term
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Definition
| Compounds of non-metal elements that are held together by sharing pairs of electrons to complete the outer electron shell. |
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Term
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Definition
| Bonding between metal atoms - the outer shell electrons are free to move about forming a 'sea of electrons'. The attraction between the negatve electrons and positive metal ions holds everything together. |
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