Atoms and electrons

Question 1

Atomic number

Answer 1

number of protons in an atom of an element

proton number

Question 2

Mass number

Answer 2

number or protons and neutrons in the nucleus of an element

nucleon number

Question 3

Ion

Answer 3

electrically charged particle
formed by loss or gain of electrons

Question 4

Isotopes

Answer 4

1. atoms of same element
2. same atomic number
3. different mass number
4. same number of protons
5. different number of neutrons

Question 5

Relative isotopic mass

Answer 5

mass of an atom of an isotope compared with 1/12th mass of carbon-12

Question 6

Relative atomic mass

Answer 6

weighted mean mass of an element compared with 1/12th mass of carbon-12

Question 7

First ionisation energy

Answer 7

energy required to remove 1 electron from each atom in 1 mol of gaseous atoms to produce 1 mol gaseous 1+ions

Question 8

Orbital

Answer 8

1. region of negative charge around the nucleus of an atom
2. can hold max 2 electrons
3. spin in opposite directions

Question 9

Draw electronic configurations up to 3D

Question 10

Draw S orbitals

Question 11

Draw P orbitals

Question 12

Ground state

Answer 12

1. how element naturally exists
2. electrons in lowest energy position

Question 13

Evidence for electron shells

Answer 13

1. Ionisation energy
2. large jumps in energy
3. electron is removed from shell nearer to nucleus

Question 14

Relative molecular mass

Answer 14

average mass of one mol of of an element of compound
compared to 1/12 mass of c12

Question 15

Mean weighted mass

Answer 15

Mean average of isotopes atomic masses
taking into account abundance