1.Dalton’s Atomic Theory
-All matter is made of atoms. Atoms are indivisible and indestructible.
-All atoms of a given element are identical in mass and properties
-Compounds are formed by a combination of two or more different kinds of atoms.
-A chemical reaction is a rearrangement of atoms
-An atom consists of a sphere of positive charge with negatively charged electron embedded in it,
;-The positive and the negative charges in an atom are equal in magnitude, due to which an atom is electrically neutral. It has no over all negative or positive charge.
-Protons in the nucleus and the electrons orbited around the nucleus.
-Electrons orbit the nucleus in orbits that have a set size and energy
-The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit
-Radiation is absorbed or emitted when an electron moves from one orbit to another.