elements

Question 1

what do elements consist of?

Answer 1

they consist of atoms with the same atomic number.

Question 2

what do atoms have?

Answer 2

• they have different numbers of protons, neutrons and electrons.
• e.g an atom with one proton in it’s nucleus is hydrogen -and an atom with two protons is helium.

Question 3

what are atoms represented by?

Answer 3

they are represented by symbols.

atoms of each element can be represented by one or two letter symbol.

Question 4

what are isotopes?

Answer 4

they are different forms of the same element, which have the same number of protons but different number of neutrons.

• isotopes have the same atomic number but different mass number.
• many elements can exist as a number of different isotopes, relative atomic mass is used instead of mass number when referring to the element as a whole. Average mass.

Question 5

what is the equation to find relative atomic mass?

Answer 5

relative atomic mass = sum of isotope abundance x isotope mass number divided by the sum of abundance of all isotopes.