elements Flashcards
1
Q
what do elements consist of?
A
they consist of atoms with the same atomic number.
2
Q
what do atoms have?
A
- 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.
3
Q
what are atoms represented by?
A
they are represented by symbols.
atoms of each element can be represented by one or two letter symbol.
4
Q
what are isotopes?
A
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.
5
Q
what is the equation to find relative atomic mass?
A
relative atomic mass = sum of isotope abundance x isotope mass number divided by the sum of abundance of all isotopes.
