Core Science C1 Chemistry

Core Science C1 Chemistry

1. Fundamental Ideas

   • An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number.
   • The sub-atomic structure of a carbon atom
   • A table to show relative charges
   • A chemical bond is a mutual attraction between two atoms resulting from a redistribution of their outer electrons.
   • An element is an atom or molecule made of a single type of atom. A compound is a molecule made of two or more different elements.
   • Atoms
     • The overall charge of an atom is 0
     • The number of protons in the nucleus is equal to the number of electrons
     • All atoms of an element have the same number of protons.
     • Atoms of different elements have different numbers of protons
     • Atoms are arranged in the modern periodic table in order of their atomic number (proton number)
   • Chemical bonding involves either transferring or sharing electrons in the highest occupied energy levels of atoms.
   • Elements in group 1 of the periodic table all have similar chemical properties. They all react with non-metal elements to form ionic compounds in which the metal has a single negative charge.
   • Elements in group 7 of the periodic table, the halogens have similar chemical properties. They react with alkali metals to form ionic compounds in which the halide ions hhave a single negative charge.

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