Question

which is the smallest LM object in the world

Answer 1

Then the atom was discovered, and it was thought indivisible, until it was split to reveal protons, neutrons and electrons inside. These too, seemed like fundamental particles, before scientists discovered that protons and neutrons are made of three quarks each.

atom is small in whole world

Answer 2

Initially atom is the smallest thing in the world
it is made up of electrons protons and neutrons which is also made up of God's particles