sub-particles
particles found in the nucleus
what are protons and neutrons
atomic number
how many protons there are
created model of atom that looks like the solar system
who is Bohr
region of space around the nucleus where electrons are found
Aristotle said matter made of 4 element
what is earth, fire, air, water
particles orbiting the nucleus
what are electrons
atomic mass
number of protons and neutrons
has the lowest energy
what is the energy level closet to nucleus
multiple orbitals together make up ________
what is an energy level
named the atom from atomos
who was Democritus
hold a positive charge
what are protons
neutral atom has
same number of electrons as protons
has the highest energy level
level furtherest from the nucleus
# of electrons found in each orbital
what is 2
model said atom was smallest part of matter - indivisible (used wooden spheres)
what are electrons
different # for each element
what are protons
how does an electron gain or lose energy
gains - moves away from nucleus
loses - moves closer to nucleus
Increase in orbitals per level
1,4,9,16
Discovered even smaller particles inside the atom -presence of electrons (negative charges) in atoms - said scattered throughout positive mass
Who is Thomson
hold no charge (neutral)
what are neutrons
what are isotopes
models possible location of electrons
what is the electron cloud
when electrons are in the lowest possible orbital (have the lowest possible energies)
what is ground state
discovered presence of nucleus - positive in mass in middle
Who is Rutherford