Atoms and Molecules Test - 7

Leucippus and Democritus are widely regarded as the first atomists in the Greek tradition. They had suggested that if we go dividing matter, a stage will come when particles obtain can’t be divided further.

The diameter of Hydrogen atom is 10⁻¹⁰m. It is the smallest atom among all elements.

Dalton was the first scientist who used the symbols to represent the elements of modern chemistry. The modern symbols are different from the symbols proposed by Dalton. Dalton, considered as the father of modern atomic theory, made a logbook entry that day titled, "Observations on the Ultimate Particles of Bodies and their Combinations."

Latin name of Potassium element is Kalium from which symbol of Potassium is derived as K.

There are 5 atoms in the phosphate ion - 1 atom of Phosphorus and 4 atoms of Oxygen.

Short hand representation of an element is called symbol. Symbol of an element is derived from English name or Latin name.

Latin name of sodium is Natrium. Therefore, the symbol of Sodium is Na.

The Latin name of Silver is Argentum. The symbol of Silver is Ag.

The valency of Ca in Ca₃(PO₄)₂is 2.

The chemical formula of a compound is formed by interchanging the valency number of the ions or the radicals. The valency number is shifted to the lower right of the ion or the radical.

Phosphorus is tetra-atomic. Each molecule of phosphorus contain 4 atoms.