Atomic Structure

Question 1

Who came up with the idea of atoms as a

fundamental particle?

Answer 1

John Dalton

Question 2

What is the relative charge on the following
sub-atomic particles?
Proton
Electron
Neutron

Answer 2

Proton = +1
Electron = -1
Neutron = 0

Question 3

Where is most of the mass of an atom located?

Answer 3

In the nucleus

Question 4

How did Marsden, Geiger and Rutherford come
up with the idea of a nucleus in the centre of an
atom? (

Answer 4

Gold leaf experiment

Question 5

What is the relative atomic mass (Ar) of a:
Proton
Neutron
Electron

Answer 5

Proton = 1 
Neutron = 1 
Electron = 1/1835 (negligible)

Question 6

What does the atomic number (proton

number) and the mass number tells us?

Answer 6

• The atomic number tells us the number of
  protons
• The mass number tells us the sum of the
  number of protons and neutrons

Question 7

Sodium (Na) has the atomic number 11 and
the mass number 23.
How many neutrons and electrons will a
sodium atom have?

Answer 7

12 neutrons

11 electrons

Question 8

What is the electron configuration of a sodium

atom?

Answer 8

11 electrons

2,8,1,

Question 9

What is the difference between these two

atoms of sodium?

Answer 9

They have different numbers of

neutrons or they are isotopes

Question 10

What is an isotope?

Answer 10

atoms of the same element,

with a different number of neutrons