chemistry year 10- atomic structure

what is the relative charge of a proton?

+1

what is the relative charge of a neutron?

0 (neutral)

what is the relative charge of an electron?

-1

where are protons found on an atom?

in the nucleus

where are neutrons found in an atom?

in the nucleus

where are electrons found in an atom?

in electron shells, orbiting the nucleus

what is the relative mass of a proton?

1

what is the relative mass of a neutron?

1

what is the relative mass of an electron?

almost 0

what does the atomic number represent?

number of protons/electrons in the atom

what does the atomic mass represent?

number of protons + neutrons in the atom

what ia an isotope?

atoms of the same element with the same number of protons but a different number of electrons 

what is an ion?

an atom that has lost/gained electrons, giving it charge

what is the nucleus of an atom made up of?

protons and neutrons

why do atoms have no overall charge?

the number of protons = the number of electrons

who discovered the electron?

J.J. Thomson

what was the ‘plum pudding model’?

atoms were thought to be a ball of positive charge with electrons embedded in it

who carried the gold foil experiment?

Hans Geiger and Ernest Marsden

what did the gold foil experiment show?

atoms have a small, dense, positively charge nucleus

who discovered that electrons orbit the nucleus in fixed shells?

Neils Bohr