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Slide 1

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Atoms
The number of protons = the number of
electrons
Mass number = protons + neutrons
Atomic number = protons
Isotopes
Isotopes
· Different atomic forms of the
same element
· Same number of protons but a
different number of neutrons.…read more

Slide 2

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Electron shells
· 1st shell: 2 2nd shell: 8 3rd shell: 8
· The group number-:
· How many electrons there are in the outer shell.
· Always require
· Full outer shell
· Either lose or gain a few electrons in ionic
bonding (sharing of electrons) - this dictates how
reactive it is.
· Group 4 is the most reactive…read more

Slide 3

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Ionic compounds
· Giant ionic structures ­
· Don't melt easily
· Very strong!
· E.g. crystals.
· High melting - boiling points
· Dissolve to form solutions
· Conduct electricity-when molten conduct
electricity too.…read more

Slide 4

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Group 1 (Alkali metals) ­ as the atoms get
bigger the outer electron is more easily lost,
so more reactive as you go down.
· Group 7 (halogens) ­ as the atoms get bigger
the extra electron is harder to gain, so less
reactive as you go down.
· Group 0 (noble gasses) ­ not reactive at all,
have a full outer shell.…read more

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