Topic 1 - Atoms

Question 1

what are the three subatomic particles in an atom?

Answer 1

proton, neutron and electron

Question 2

what is the relative mass and charge of a proton?

Answer 2

relative mass is 1, relative charge is +1

Question 3

what is the relative mass and charge of a neutron?

Answer 3

relative mass is 1, relative charge is 0

Question 4

what is the relative mass and charge of an electron?

Answer 4

relative mass is 0, relative charge is -1

Question 5

where is the nucleus?

Answer 5

in the middle of the atom

Question 6

what does the nucleus contain?

Answer 6

protons and neutrons

Question 7

what is the charge on the nucleus?

Answer 7

positive because of the protons

Question 8

where is all the mass of an atom?

Answer 8

in the nucleus

Question 9

where are the electrons in the atom?

Answer 9

‘orbiting’ around the nucleus in shells

Question 10

how can atoms be neutral?

Answer 10

the number of electrons equal the number of protons, so there is no overall charge

Question 11

what happens if electrons are added or removed from an atom?

Answer 11

the atom becomes charged

Question 12

what is the atomic number?

Answer 12

how many protons there are

Question 13

what is the mass number?

Answer 13

the total of protons and neutrons

Question 14

how do you get the number of neutrons?

Answer 14

subtract atomic number from mass number

Question 15

what is a molecule?

Answer 15

atoms joined together (e.g. H2 or H2O)