radiation

Question 1

what are the charge of the parts of an electron?

Answer 1

• electrons ➡️ negative
• protons ➡️ positive
• neutrons ➡️ neutral

Question 2

what is the top and bottom number of an atom?

Answer 2

top number

• mass no.
• no. protons and neutrons

bottom number

• atomic
• proton no. and same as electrons

Question 3

where is the majority of the mass of the atom?

Answer 3

in the nucleus

Question 4

what is most of the atom full of?

Answer 4

empty space

Question 5

what is the relative mass of protons and neutrons?

Answer 5

1

Question 6

what is the plum pudding model?

Answer 6

belief that an atom was completely positive in charge with electrons embedded in it

Question 7

similarities and differences to plum pudding model and atom idea know

Answer 7

similarities

• both contain electrons and protons
• say its spherical
• both say protons are positive

differences

• no neutrons in p.p.m
• electrons in inside of p.p.m
• p.p.m was a solid mass, empty today

Question 8

what happened in the Rutherford scattering experiment?

Answer 8

alpha fired through thin gold foil ➡️ alpha passed straight through ➡️ he found out that there was empty space ➡️ some particles bounced back because + and - repelled

Question 9

why does most alpha particles pass straight through?

Answer 9

as atom is mainly empty space

Question 10

why does some alpha deflect back?

Answer 10

because nucleus is + and + alpha particles repel

Question 11

why does a very small amount of alpha deflect?

Answer 11

because its close to a small positive nucleus