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Science revision Aus
Cards in this deck (15)
- 1Atoms-Smallest piece of an element
- Can be broken into smaller parts but
not broken down - 2Elements-Pure substance can't be broken into another substance
- Contains 1 type of atom - 3Molecules- When atoms bond together
- Consists of 2 or more types of atoms joined together --> same or different types - 4Compounds-When molecules bond together
e.g. H2O is a molecule but a glass of water is a compound
- can form a small group of molecules or be structure to each other to form a lattice structure - 5Mixtures- A number of compounds mixed together
- There is no bond, they are simply mixed - 6Structure of an AtomAtoms consist of a nucleus that contains Protons and Neutrons surrounded by electrons
- 7Inside atoms-Atomic Number = No. of protons
-Mass Number = No. protons + neutrons
-Neutrons = atomic mass - atomic number - 8Isotopes- Atoms of the same element with different No. of neutrons
- Almost every element has 2 isotopes - 9Ions- When atoms gain or lose electrons
- 10Cations+ve charge = lost electrons so there are more protons than electrons
e.g. Lithium atom
starts with 3 electrons loses 1 - 11Anions-ve charge = gained electrons sp there are fewer protons than electrons
e.g. Chlorine atom starts with 17 electrons loses 1 - 12Ionic Compounds- When anions and cations come together they form ionic compounds
- Must contain one of each - 13Bohr DiagramNumber of rows down = No. of shells
Atomic number = total No. of electrons on shells
2 x n to the power of 2 = No. of electrons per shell
n = No. of shells - 14Bonds- Chemical bonds hold multiple elements together to create molecules
- 15Writing Ionic Formulas
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- Flashcards on Science revision Aus, created by Abi Kinn on 18/06/2017.
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- Abi Kinn
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