Atoms

Question 1

What’s the radius of an atom

Answer 1

0.1 nanometers

Question 2

State the points about the nucleus:

Answer 2

• it’s in the center
• contains protons + neutrons
• the nucleus = 110 *=-14
• majority of the mass is concentrated here

Question 3

Give information on electrons:

Answer 3

• move around the nucleus in electron shells
• negatively charged
• tiny but take up a lot of space
• volume of orbit determines size of atom
• no mass in them…

Question 4

What the relative mass + charge of the subatomic particles?

Answer 4

Proton =     1     +1
Neutron =    1     0
Electron =     1     -1

Question 5

Why are atoms neutral?

Answer 5

Same amount of positive and negative charge so it cancels out

Question 6

Describe the term ‘ion’:

Answer 6

Charged particle

Question 7

What is the nuclear symbol made of?

Answer 7

Atomic number = proton

Mass number = proton + neutron