atomic structure

Question 1

what does an atom consist of

Answer 1

a nucleus (central) containing protons and neutrons
surrounded by electrons in energy levels (shells)

Question 2

do atoms have an electric charge

Answer 2

no, cause same number of protons and electrons

Question 3

name the 3 types of subatomic parties and their masses/charges

Answer 3

proton, 1, +1
neutron, 1, neutral
electron, 1/1840, -1

Question 4

atomic number is

Answer 4

number of protons

Question 5

mass number

Answer 5

number of protons and neutrons

Question 6

what defines an element

Answer 6

number of protons

Question 7

what is an isotope of an element

Answer 7

have the same number of protons but different numbers of neutrons.
same atomic number but different mass number
so chemically they will react in exactly the same way, but physically they will have different properties

Question 8

define relative atomic mass (Ar) of an element

Answer 8

the mass one of its atoms relative to 1/12 the mass of one atom of C-12 (average mass of an isotope, taking into account the abundance of each isotope)

Question 9

what is the equation for Ar

Answer 9

Ar = average mass of an atom X 12 / mass of one atom of C-12

Question 10

what is the 1st ionisation energy

Answer 10

energy required to remove 1 electron from each atom in a mole of gaseous atoms producing 1 mole of 1+ gaseous ions

Question 11

what 3 things affect ionisation energy

Answer 11

distance from nucleus
nuclear charge
shielding

Question 12

which atoms are exceptions to electronic config

Answer 12

Cu and Cr