Atomic number (Z) is defined as the number of protons in the nucleus of an atom. It determines the identity of the element. In a neutral atom, the number of electrons equals Z. Mass number = protons + neutrons.
Explanation:
A separating funnel allows immiscible liquids to form layers; the denser liquid is drained from the bottom. Fractionating column is for miscible liquids with close boiling points, condenser for distillation, centrifuge for separating fine solids or liquids of different densities by spinning.
Explanation:
John Dalton proposed the atomic theory in 1803. His theory stated that all matter is made of indivisible and indestructible atoms, atoms of a given element are identical in mass and properties, and compounds are formed by combinations of different atoms in fixed ratios.
No comments yet. Be the first to start the discussion!