state four properties / characteristics of metals.

what are the differences between groups and periods on the periodic table?

what is a element?

what is a compound?

name a compound?

Name two mixtures?

what is a mixture?

what is a atom

what is a molecule?

name two molecules?

finish this equation
zinc + sulphuric acids = ? + ?

finish this equation:
Ca + ? = CaCl2 + ?

finish this equation:
iron + oxygen = ?

finish this equation
2Cu + O2 = ?

Finish this equation
potassium + water = ? +?