0

p+ and n found in nucleus; e- found in cloud around nucleus

Bottom # on the periodic table; Top number for nuclear notation; add protons and neutrons

atomic # - # e- or # p+ - # e-

At the beginning of the universe, it was too hot for matter to form, so protons, neutrons, and electrons were a mixture called "cosmic soup."

black dwarf; the star has cooled, so fusion of larger atoms can occur

Atom with a different number of neutrons. C-14

Large amounts of helium provide evidence that the universe was really hot.

proton (+), neutron (neutral), electron (-)

Star and anything orbiting around it

massive stars

A large formation of stars surrounding a black hole.

X axis