topic 1: atomic structure and the periodic table Flashcards
what 3 sub atomic particles are atoms made up of?
protons, neutrons and electrons
what is the relative atomic mass of a proton, electron and neutron?
p: 1
n: 1
e: very small
what is the relative charge of an atom?
0, as the negative electron is balanced with the positive proton
what are the relative charges of protons, electrons and neutrons?
p: +1
n: 0
e: -1
what is the radius of a nucleus?
1x10^-14 (around 1/10000 of an atom)
what charge does the nucleus of an atom have?
positive
where is the mass of an atom most concentrated?
the nucleus
what does the mass number tell us?
the total number of protons and neutrons
what does the atomic number tell us?
how many protons/electrons there are in an atom
what is it that defines what type of atom something is (what element)?
the no. of protons
what element is Pb?
lead
what are isotopes?
different forms of the same element, which have the same number of protons but a different number of neutrons
isotopes have…
the same atomic number but different mass numbers
how do you calculate relative atomic mass?
sum of (isotope abundance x isotope mass number) / sum of abundances of all the isotopes
what are compounds?
two or more elements, chemically bonded
