What is a metal?
Chemical change evidence
bubbling, temperature changes, unexpected color changes, formation of precipitate.
Metals location
left hand side
Metalloids
Zigzag or stairstep line seperates metals and non metals - metalloids adjacent to either side of the stairstep line - except aluminum is a metal
Bondind atoms and etc.
- Atoms combine when the positive charge in one atom is attracted to the negative charge of another atom - Metals have fewer valence electrons, the attraction between the nucleus and valence electron is weaker.
Metalloids
- Boron - Silicon - Germanium - Arsenic - Antimony - Tellurium - Polonium - Astatine
Octet Rule
- Elements bond by getting rid of valence electrons, to get to 0 valence electrons, while non-metals steal or share electrons to get 8 valence electrons. - Valence electrons are the controlling factors for the physical and chemical properties of the atoms.
Non- Metals
- Right hand side - special type of non-metal called noble gases
Noble gases
- called noble gases b/c unlikely to react with other elements - makes them stable, unlikely to react with other elements
three major groups
-metal - non metal - metalloid
Chemical Changes
Permanent changes in the arrangement of atoms that result in new compound.
Physical Change
Physical Changes: alter size, shape, or state of objects.
Chemists refer to substances....
that are mixed together as reactants and substances that are mixed together as reactants and substances that are made during the reaction as a product.
