John Dalton's 5 Postulates of Atomic Theory

1. Elements are made of tiny particles called atoms.
I think this is true, because atoms are the building blocks of the universe; they can combine in many ways to form all the compounds in the universe.

2. All atoms of a given element are identical.
I think this is true, because the atoms must be identical to have identical properties.

3. Atoms cannot be split, created, or destroyed.
I think this is not true, because one of the greatest scientific advances of the last century was when we split the atom, leading to the creation of nuclear energy and the atomic bomb. However, it is true that atoms cannot be created or destroyed.

4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
I think this is true, because the atoms bond together to form compounds. For example, water is H2O (2 hydrogen for every 1 oxygen).

A chemical reaction is a rearrangement of atoms.
I think this is true, because in a chemical reaction, molecules split and recombine to form new substances.