Electrons
Valence Electrons- A valance electron is only looking at the last ring on the outside
This periodic table is showing group 1
In an atom there are available spaces in the electron cloud
for electrons. They can be called energy levels, shells and
orbitals(We only draw it like this, but they move)
The first ring can hold up to 2 electrons.
The second and third rings can hold up to 8 electrons
In an uncharged atom, the protons equal the electrons
The picture shows the available spots that electrons can go
Notice that the elements drawn above show the electrons for each atom. They ALL
have 1 valence electron. The electron in the outside shell. If every atom in group 1 was
drawn, they would ALL have 1 valence electron in the outermost shell.
Lewis Dot Diagrams-
Because each element has 1 valance
electron, instead of drawing the
entire atom we can now write the
elements symbol with dots that
represent how many valence
electrons there are.
All atoms in group 1 have 1 valence
electron, so they all have 1 dot.
This is an example of 2 of the elements in group 2.
Every element in group 2 has 2 valence electrons!
Every element in group 2 has 2 valence
electrons! Instead of drawing the entire
atom model, you can write the element
symbol with at dot at the top and a dot at
the bottom of the symbol. This represents
the valence electrons (the electrons on the
outer most shell).
