particles

Question 1

How small is an atom?

Answer 1

Radius of about 1 × 10^-10 metres
The radius of a nucleus is less than 1/10 000 of the radius of an atom.
Most of the mass of an atom is concentrated in the nucleus.
Few hundred picometres across

Question 2

Give the characteristics of protons

Answer 2

Charge of 1.60×10^-9 C
quarks - uud
mass 1.673×10-27 kg

Question 3

Give the characteristics of electrons

Answer 3

charge -1.60×10−19 C

mass 9.11x10^-31 kg

Question 4

In what environment would the relative mass of an atom change?

Answer 4

None

Mass is constant across all environments

Question 5

Give the characteristics of neutrons

Answer 5

charge 0
mass 1.673x10^-27 kg
quarks udd

Question 6

What is the approximate radius of a nucleus relative to the atom?

Answer 6

1/10, 000

Question 7

What are the units of specific charge?

Answer 7

C/Kg

CKg^-1

Question 8

What term means “per unit mass” when describing the charge of a particle?

Answer 8

Specific