This video gives detail explanation on the 3 subatomic particles of an atom: protons, neutrons & electrons.
This video gives an introduction on what is an atom, explains the 3 subatomic particles of an atom: protons, neutrons & electrons, and shows how atoms bond to form molecules.
This video explains the atomic number (proton number) & mass number (nucleon number), and how to calculate the number of neutrons if both atomic number & mass number is given.
These videos explain what isotopes are.
Note: atomic number is also known as proton number; mass number is also known as nucleon number.
This video shows how to write electron configuration for Lithium, Carbon & Magnesium.
Note: For SPM exam, the way of writing the electron configuration (electron arrangement) is slightly different from this video. Dots are used to separate the number of electrons in each shell instead of using commas.
Example: Lithium has an electron configuration of 2.1
These videos explain how atoms form ions.