atoms and elements

atoms and elements

1. atoms contain protons ,neutrons and electrons

2. protons have a positive charge and electrons have a negative charge making the atom neutral

3. neutrons have no charge

4. when atoms are chemically joined they become an element

5. elements can have up to eight shells

6. when atoms join together a reaction is produced because of electrons adding onto another shell

7. periodic table

   • all of the elements are on this table are ordered by there atomic number
   • all the elements in group one have one outer shell
   • it lists the elements in groups. they do this by grouping it with similar elements and their properties
   • group 7 are called halogens

8. atoms have a nucleus and this is made up of protons and nuetrons

9. protons have the same amount of number as electrons

10. how to read an element

    • the biggest number is always going to be the mass
    • the smaller number is always going to be the protons which is equal to the amount of neutrons
    • to find out neutrons you minus big from small
    • the symbol is always in the middle
    • be careful because sometimes the symbol is completely different to the name of the element

11. when two elements are chemically joined it is called a compound

12. the compounds always have there formulae

13. for example you would write it like this magnesium + oxygen (arrow) magnesium oxide

14. Mg + 02 (arrow) Mg0

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