Slides in this set
The number of protons = the number of
Mass number = protons + neutrons
Atomic number = protons
· Different atomic forms of the
· Same number of protons but a
different number of neutrons.…read more
· 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
· 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
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