P3-atoms structure + history

Question 1

what are subatomic particles?

Answer 1

electrons, protons, neutrons

Question 2

What is the relative mass?
relative charge?
and location? of a proton

Answer 2

Relative mass =1
charge = +1
location = nucleus

Question 3

What is the relative mass?
relative charge?
and location? of a neutron

Answer 3

relative mass =1
charge= 0
location= nucleus

Question 4

What is the relative mass?
relative charge?
and location? of an electron

Answer 4

relative mass = 0
charge = -1
location= electron shells (which orbit nucleus)

Question 5

what was 1887 JJ THOMPSON theory on the atom?

Answer 5

-discovery of ELECTRON
-known as “plum pudding model”
-packed spheres with POSITIVE MATTER
-filled with NEGATIVELY CHARGED electrons

Question 6

What was Ernest RUTHERFORD’s theory on atom?

Answer 6

-atoms are largely EMPTY SPACE
-just a few electrons
-most of POSITIVE mass in centre (NUCLEAS)

Question 7

how did RUTHERFORD come to his conclusion of atom? ( practical preformed)

Answer 7

shoot small positively charged alpha particles at a sheet of gold foil.

Question 8

What was 1913 Neils BORE’s theory on the atom?

Answer 8

-ORBIT NUCLEAS
-at fixed energies and distances