PERIODIC TABLE
Cards (13)
- elements - pure substance cannot be broken down to simpler substances
- compunds - 2 or more different elements
- molecules can be compounds and not all molecules are compounds (kay need 2 or more different elements to be considered as compound)
- compounds - always in same proportions
- halogens - highly reactive with metals
- noble gases- UNREACTIVE, colorless, odorless
- carbon - high melting and boiling points
- nitrogen - conductor of electricity when heated
- alkaline earth metals- high density, higly reactive
- alkali metals - highly reactive but low density
- transition metal- more than 1 charge, hard, solid at room temp, shiny
- boron -brittle hard and low melting point
- most reactive group- alkali