understanding the atom

Question 1

what did democritus state?

Answer 1

• atoms were tiny spheres and the smallest piece of matter

Question 2

what did john dalton also initially create?

Answer 2

• the periodic table

Question 3

what did JJ Thompson discover?

Answer 3

• electrons

Question 4

what did JJ Thompson create?

Answer 4

• the plum pudding model- it was believed that the atom was a ball of positive charge with electrons embedded in it.

Question 5

what experiment did Ernest Rutherford do?

Answer 5

• Alpha particle scattering experiment

Question 6

what did the Alpha particle scattering experiment prove?

Answer 6

• most of the mass atom is concentrated in the nucleus which was charged

Question 7

what did niels bohr create and find?

Answer 7

• created the nuclear model
• found out that electrons orbited around the nucleus at specific distances also known as energy levels

Question 8

what did james chadwick discover?

Answer 8

• discovered neutrons