(Remember this isn't always necessarily correct.. the biggest number in that atom tends to be the Mass Number)
- Elements consist of one type of atom only
- Compound's are chemically bonded ( they are formed when two or more elements react together (chemically).)
It is important to note that it is difficult to separate the two original elements out again (unless it is a reversible reaction)
Isotopes are different atomic forms of the same elements, which have the SAME number of PROTONS ( but a DIFFERENT number of NEUTRONS)
Periodic Tables: Vertical columns = Groups. Horizontal rows = Periods
Group 1 elements - Alkali Metals; Group 7 = Halogens ; Group 0 = Noble Gases
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