The last column of the periodic table contains the noble gases elements that do not easily form chemical bonds. Why don’t these gases
tend to form chemical bonds?

its is because the chemicals are very diffraction from each other so which makes it difficult to form a chemical bond.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.