ATOMIC STRUCTURE AND THE
PERIODIC TABLE
01 ATOMS
An element is a pure substance made up of only one type of atom.
John Dalton proposed that there are different types of atoms.
Structure of an atom:
- A central nucleus containing protons and neutrons
- Electrons orbit the nucleus
The number of protons and neutrons are the same because one is positive and
one is negative , there is no overall charge.
, ATOMIC STRUCTURE AND THE
PERIODIC TABLE
In the above element, there are :
- 2 protons
- 2 electrons
- 2 neutrons
02 HISTORY OF AN ATOM
John Dalton - early 1800s
From his experiments, he suggested that substances were made up of
atoms that were like hard, tiny spheres. He also said that each element had
different mass and shapes.
J.J Thompson - end of 1800s
j.J Thompson discovered electrons. He found out
that negatively charged particles were electrons.
He also proposed a different model of the atom.
PERIODIC TABLE
01 ATOMS
An element is a pure substance made up of only one type of atom.
John Dalton proposed that there are different types of atoms.
Structure of an atom:
- A central nucleus containing protons and neutrons
- Electrons orbit the nucleus
The number of protons and neutrons are the same because one is positive and
one is negative , there is no overall charge.
, ATOMIC STRUCTURE AND THE
PERIODIC TABLE
In the above element, there are :
- 2 protons
- 2 electrons
- 2 neutrons
02 HISTORY OF AN ATOM
John Dalton - early 1800s
From his experiments, he suggested that substances were made up of
atoms that were like hard, tiny spheres. He also said that each element had
different mass and shapes.
J.J Thompson - end of 1800s
j.J Thompson discovered electrons. He found out
that negatively charged particles were electrons.
He also proposed a different model of the atom.
