C2.2 - Electronic structure
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groups
shows how many electrons are in the outer most shell
periods
shows the number of shells in an atom
outer most shell =
highest occupied energy level
Why do elements in the same group react similarly?
As they have the same number of electrons in the outer most shell.
General properties of a metal
• good conductor of electricity • higher melting/boiling points • ductile/malleable. • always form positive ions
General properties of a non-metal
• electrical insulator • brittle • found above staircase of periodic table • always form negative ions
Group 0 aka
Noble gases
Noble gases qualities
• full outer most shell = very stable atom • cannot gain/lose electrons • monatomic (single atom) gases - don’t react to form molecules • boiling points increase as you go down the group