1. the atom

Question 1

what are atoms

Answer 1

what all elements and compounds are made of

Question 2

what are atoms made up of

Answer 2

3 types of subatomic particles
protons
neutrons
electrons

Question 3

proton

1. relative mass
2. relative charge

Answer 3

1. 1

2. +1

Question 4

neutron

1. relative mass
2. relative charge

Answer 4

1. 1

2. 0

Question 5

electron

1. relative mass
2. relative charge

Answer 5

1. 1/2000

2. -1

Question 6

what does the mass number tell you

Answer 6

total number of protons and neutrons in the nucleus

Question 7

what does the atomic number tell you

Answer 7

number of protons in the nucleus (identifies the element)

Question 8

what do all atoms of the same element have

Answer 8

the same number of protons

Question 9

how to work out the number of neutrons

Answer 9

mass number - atomic number

Question 10

ions have different numbers of

Answer 10

protons and electrons

Question 11

negative ions have

Answer 11

more electrons than protons

Question 12

positive ions have

Answer 12

more protons than electrons

Question 13

what are isotopes

Answer 13

isotopes of an element are atoms with same number of protons but different number of neutrons

Question 14

what decides the chemical properties of an element

Answer 14

number and arrangement of electrons

Question 15

what decides the physical properties of an element (e.g. different densities)

Answer 15

depends more on the mass of the atom