The mass of a proton is approximately equal to the mass of
(1) an alpha particle (3) a neutron
(2) an electron (4) a positron

Which other elements contain the same number of outer electrons as sodium

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The energy that powers a hurricane is derived from