Atomic structure Flashcards
(14 cards)
who discovered the electron and what was his model of the atom called
Thomson, plum pudding model
who revised Thomsons model to a model which has electrons orbiting a positive nucleus
Rutherford
who discovered the neutron
Chadwick
what is the relative mass, charge and position of a proton
mass- 1
charge- +1
position- nucleus
what is the relative mass, charge and position of an electron
mass- 1/1840
charge- -1
position- shells
what is the relative mass, charge and position of a neutron
mass- 1
charge- 0
position- nucleus
what is the atomic number
the number of protons in (the nucleus of) an atom
what is the mass number
the total number of protons and neutrons in (the nucleus of) an atom
what is an element
a substance that consists of only one type of atom and it cannot be broken down into anything simpler by chemical means
how many electrons can go in shells 1, 2 and 3
2
8
8
what is a cation
a positive ion
what is an anion
a negative ion
what are ions
atoms with electric charges
what is an isotope
atoms which have the same number of protons (so they are atoms of the same element) but have different numbers of neutrons (so they have a different mass number)
