Atomic Structure Flashcards
the periodic table is organised by
increasing atomic number
group 1 metals are called
alkali metals
group 7 are called
the halogen
group 8/0 are called
noble gases
elements in the same group have
the same number of outer electrons
elements in the same period (across the way) have
the same number of energy levels
what subatomic particles are IN THE NUCLEUS
protons
neutrons
where are electrons found
energy levels
describe a proton
charge - 1+
mass - 1 amu
describe a neutron
charge - 0
mass - 1amu
describe an electron
charge - 1-
mass - 0
why is an atom neutral
same number of protons and electrons so charges cancel out
what is atomic number
number of protons
what is the mass number
number of protons + number of neutrons
what is an ion
an atom that has lost or gained electrons giving it is a charge
