Dalton’s Atomic Theory John Dalton was a Chemist
Dalton’s Atomic Theory
John Dalton was a Chemist, physicist and meteorologist born in September 6, 1766 .
Daltons Atomic Theory states that:
An element consists of small, tiny particles called atoms, that cannot be seen with the naked eye.
All atoms of a certain element were exactly the same ( Identical)
All atoms were indivisible and could not be created or destroyed
Atoms bind together and separate during a chemical reaction.
All atoms merge in straightforward, uncomplicated ratios .
Thompson’s Atomic Theory
Sir Joseph John Thomson was a English noble prize winning physicist who first discovered the electron in 1897. He was born ion the 18 December 1856.
Thomson’s Atomic Theory states that:
Atoms have the identical positive and negative charges regarding the magnitude. Therefore the entire atom is neutral (has no charge)
The structure of the atoms depicts a sphere with a positive charge with electrons in the sphere.
Bohr Atomic Theory
Niels Henrik David Bohr was a Danish physicist and Noble Prize winner born on the 7 October 1885
Bohr’s Atomic Theory states that:
An atom consists of positively charged nucleus surrounded by orbiting electrons.
Electrons travel in separate orbitals
The nucleus and the number of protons and electrons determine the properties of the element.
Rutherford’s Atomic Theory
Ernest Rutherford was New Zealand-born British physicist born in 30 August 1871
An atom consists of large empty spaces
The positive charge is all concentrated in the centre of the atom in a small region called a nucleus.
A strong electrostatic force holds together the nucleus and electrons.
The atom is completely neutral
The electrons move around the nucleus in an established circular path very fast.