Atoms are arranged in rows on the periodic table. As you go from left to right along a row the atomic number of each element increases by 1. The elements gain one proton and one electron
The Periodic Table of all the elements in the universe left after recycling through supernova on Prezi
Flick through the presentation as far as the brainiac video we watched in class. There are a number of points that need explaining about elements in that first column of the periodic table.
- Lithium sodium potassium and rubidium all look similar.
- they are all very reactive
- They are all soft and can be cut easily with a knife
As a group they are known as the alkali metals:
Complete this exercise for tomorrow
Lithium has an atomic number of 3, the atomic number of Sodium is 11 and potassium 19. Draw diagrams of of lithium sodium and potassium ions showing how many electrons there are in each shell. What do these atoms have in common and why do you think they have similar properties. At the very least you should be able to draw the diagrams.