Frequently Asked Questions
An atom is the smallest particle of an element that retains its chemical properties.
A molecule is a group of two or more atoms chemically bonded together.
Dalton’s theory states matter is made of indivisible atoms, identical for each element, combining in fixed ratios.
A chemical formula represents a compound using symbols and shows elements’ proportions.
Atomic mass unit is a standard mass unit equal to 1/12 the mass of one carbon-12 atom.
Atomicity is the number of atoms in a molecule of an element or compound.
A mole is the amount of substance containing Avogadro’s number of particles (6.022 × 10²³).
Mass is neither created nor destroyed during a chemical reaction.
Elements combine in a fixed mass ratio to form a compound.
It is the ratio of the average atomic mass of an element to 1/12 of a carbon-12 atom’s mass.
Avogadro’s number is 6.022 × 10²³, the number of particles in one mole of substance.
An ion is an atom or molecule with a net electric charge due to electron gain or loss.
Atom is a single particle; molecule consists of two or more atoms bonded together.
The symbol for sodium is Na.
Polyatomic ions are ions formed by a group of atoms with an overall charge.