test 1, atoms and ions, revision Flashcards
mass, charge and location of neutron
1
neutral
nucleus
mass, charge and location of proton
1
+
nucleus
mass, charge and location of electron
1/2000
minus
shells surrounding nucleus
atomic number tells you
number of protons, sometimes number of electrons
mass number tells you
protons + neutrons
isotope definition
variations of an atom that have the same number of protons but different numbers of neutrons. they have the same chemical properties but different physical properties
RAM
(percentage x mass number) + (percentage x mass number)… divided by 100
how do atoms from groups 1-3 form ions and what charge is that ion
by losing electrons, they get a positive ion
how do atoms from groups 5-7 form ions and what charge is that ion
by gaining electrons, they form a negative ion
why are noble gases unreactive (can’t become ions)
they already have a full outer shell
how do you indicate the charge of the ion on a transition metal
using roman numerals
describe an ionic compound
the ratio of ions in the formula
formula for hydrogen
H2
formula for oxygen
O2
formula for nitrogen
N2