atoms and elements

Question 1

radius of an atom

Answer 1

0.1 nanometres (1 x 10⁻¹⁰ m)

Question 2

radius of a nucleus

Answer 2

1 x 10⁻¹⁴ m (around 1/10000 radius of an atom)

Question 3

list the sub-atomic particles

Answer 3

protons, neutrons, electrons

Question 4

mass and charge of proton

Answer 4

1, +1

Question 5

mass and charge of neutron

Answer 5

1, 0

Question 6

mass and charge of electron

Answer 6

1/1840, -1

Question 7

charge of an atom

Answer 7

0, neutral

Question 8

why do atoms have a neutral charge

Answer 8

they have the same number of protons and electrons so the charges cancel out

Question 9

atomic number

Answer 9

number of protons

Question 10

mass number

Answer 10

total number of protons and neutrons

Question 11

how to work out number of neutrons

Answer 11

mass number-atomic number

Question 12

elements

Answer 12

substance consisting of the same atoms

Question 13

which number determines the type of atom

Answer 13

proton number

Question 14

what is an atom?

Answer 14

the smallest part of an element that can exist

Question 15

what is an element?

Answer 15

a substance of only one type of atom

Question 16

what are the two groups elements can be classified in?

Answer 16

metals and non-metals