Elements
- Created by: ElizabethStudies
- Created on: 03-05-19 19:41
View mindmap
- Elements
- Elements consist of atoms with the same atomic number.
- Atoms of each element can be represented by a one or two letter symbol.
- Isotopes
- Isotopes are different forms of the same element, which have the same number of protons but different number of neutrons.
- Isotopes have the same atomic number but a different mass number.
- Relative atomic mass is used instead of mass number.
- relative atomic mass= sum of(isotope abundance x isotope mass number) / sum of abundances of all the isotopes.
- Group 1 Elements
- Group 1 elements are known as the alkali metals and they are Lithium, Sodium, Potassium, Rubidium, Caesium and Francium.
- They are very reactive because they only have 1 electron in their outer shell so they don't need much energy to lose it. They are all also soft and have low density.
- As you go down group 1: The reactivity is increased. They have lower melting and boiling points and the higher the relative atomic mass.
- Group 7 Elements
- Known as Halogens. They include Fluorine, Chlorine, Bromine and Iodine.
- As you go down group 7: They become less reactive, Have higher melting and boiling points and Higher relative atomic masses.
- More reactive halogens will displace less reactive ones.
- Group 0 Elements
- Called the noble gases they include Helium, Neon and Argon.
- They have 8 electrons in their outer shell giving them a full outer shell.
- The Boiling points increase as you go down the group and the relative atomic mass increases.
Comments
No comments have yet been made