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15 Cards in this Set
- Front
- Back
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Element |
A substance made up of only one type of atom. |
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Compound |
A group of 2 or more types of atoms chemically combined. |
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Mixture |
A group of 2 or more types of atoms not chemically combined |
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Mass number |
The total number of protons and neutrons in an element. |
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Atomic number |
The total number of protons |
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Ionic bond |
A chemical bond between a metal and a non-metal ion |
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Covalent bond |
A chemical bond between non-metal atoms that combine by sharing electrons. |
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Difference between an atom and a molecule |
An atom is on its own and not combined with anything, but a molecule is a group of atoms chemically combined. |
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How to find out how many neutrons there are in an atom |
Mass number (bigger) - atomic number (smaller) |
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How to find how many protons there are in an atom |
Look at the atomic number |
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How many electrons can each shell of an element hold? |
1st shell = 2 electrons 2nd shell = 8 electrons 3rd shell = 8 electrons |
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How to find out which group an element is in |
Number of electrons on the outer shell is the same group number. |
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Why are elements in noble gases so unreactive |
They have a full outer shell if electrons |
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Formation of a positive ion |
When a metal loses electrons in order to gain a full outer shell |
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Formation of a negative ion |
When a metal gains electrons in order to get a full outer shell |
