Summary Structure of periodic table :)

Structure of periodic table:
Groups- columns (GC)
Periods- rows (PR)
1- alkali metals
2- alkali earth metals
3- transition metals
4- Metal/non-metal line
5- halogens
6- noble gases


Every element has its own symbol
The numbers tell you how many protons, neutrons and
electrons there are in the atoms.
Protons + In the nucleus
Neutrons Neutral In the nucleus
Electrons - The shell
surrounding the
nucleus




The smaller number is the atomic number (it tells you
how many protons there are)
The bigger number is the mass number (it tells you how
many mass there is = protons + neutrons.

, Boron =
Mass number- 11
Atomic number- 5


First shell- two atoms max
Second shell- 8 atoms max
Third shell- 8 shells max


The number of atoms surrounding the shell is based on
the atomic number.


Element \ observation
Lithium The cut surface is shiny,
gentle and fizzy. UI goes
blue.
Sodium Cut surface is shiny and
floats on surface and melts
into a ball. UI goes blue
Potassium Cut surface is shiny,
vigoursly fizzes and burns
with a lilac flame.
Rubidium Very fast reaction with air
Shower of sparks
Caesium Reacts explosively


As you go down the group the more reactive it gets.