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Atoms ions and compounds (Ions (Ions are charged atoms that are either…
Atoms ions and compounds
Atoms
Protons, Neutrons and Electrons
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Relative Atomic Mass: The weighted mean mass of an tom of an element compared with 1/12 of an atom of carbon-12. Ar= (Average mass per atom of an element/the mass of one atom of carbon- 12) X 12
Relative Isotopic mass: The mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12.
Isotopes
Atoms with the same atomic number but different mass number or the same number of protons but different number of neutrons
Properties: Chemical properties of isotopes are identical but physical properties (like density) can differ.
You can find out how many isotopes an element has by using a mass spectrometer due to each isotope being a different weight so the different ions will travel at different speeds because they were all given the same kinetic energy in the previous chamber.
You can calculate the relative atomic mass of an element by multiplying the mass number of each isotope by the percentage of it present, adding them all together and dividing that number by 100.
Ions
Ions are charged atoms that are either positive or negative based on whether they have more electrons or less electrons than protons
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Ionic equations: An ionic equation just shows the particular species that change during a reaction. Unlike a full chemical equation
Group 13=+3, Group 14=+4, Group 15=-3, Group 16=-2, Group 17=-1
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Sometimes ions contain more than 1 ion, These are called polyatomic for example NH4+
Compounds
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Compounds have different properties to their reactants as they are usually more stable as electrons are being shared.
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