Atoms

Question 1

what does the atomic number show

Answer 1

the number of protons and electrons

Question 2

what does the mass number show

Answer 2

the number of protons and neutrons

Question 3

what is an isotope

Answer 3

an atom that has the same number of protons and electrons but a different number of neutrons

Question 4

what is an ion

Answer 4

an atom with a charge

Question 5

which scientists came up with ideas about atoms in order

Answer 5

Dalton
Thompson
Rutherford
Bohr

Question 6

what were daltons ideas about atoms

Answer 6

small, round, hard and indivisible

Question 7

what did Thompson discover

Answer 7

electrons

Question 8

what was his model and what did it state

Answer 8

plum pudding model, atoms had an overall positive charge, with negative electrons dotted around it

Question 9

what did Rutherford discover

Answer 9

nucleus

Question 10

describe rutherfords experiment

Answer 10

rutherford shot alpha particles at a piece of thin gold foil and used a fluorescent screen to analyse where they would end up. although most alpha particles went straight through some bounced off, which shows that there was a small positive nucleus in atoms

Question 11

what did Borh discover

Answer 11

electron shells

Question 12

what is a shell

Answer 12

set distances from the nucleus that electrons could orbit in