Atoms

• electron shell goes 2-8-8...
• Atomic number = # of protons
• 1 proton is equal to 1 atomic weight
• Halogens -Extremely reactive non-metals
• Alkaline Earth Metals - second most reactive metals
• Noble gases - non reactive fellas.
• Vaence Shell - Outer shell
• Reactions only occur with the valence shell
• Valence Shells want stability either 8 or 2 ring or 8 or 2 total
• Protons attract electrons
• the farther electrons are from nucleus the weaker their bond
• Bigger metals are more reactive and loose electrons
• Smaller non-metals are more reactive and steal electrons
• Atoms share electrons rather than give them away
• Cation - +
• Anion - -
• You must round up the atomic weight to find the # of electrons
• Alkali - Metals, Reactive, one valence electron
• Alkalaine - Metals, Reactive, 2 valence electrons
• Halogens - Reactive, non metals, 7 valence electrons
• Noble gases - No reaction, Full valence shell
• More electrons makes atom squeeze
• The further elements to the right, the smaller they are in radius
• Metals get rid of electrons
• Non-metals steal electrons
• Number of Electrons change in Ions
• Lewis dot diagrams - Name + dots around
• 2NA = The two means DOUBLE IT