The number of in the nucleus determines an element's atomic number. this number defines the name of the element, no other element shares that atomic number.

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 mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Which change in temperature is the smallest? a change of 1 thomson degree a change of 1 kelvin degree a change of 1 fahrenheit degree a change of 1 celsius degree