All atoms of the same element have the same number of which is called the atomic number.
a. electrons
b. protons and neutrons
c. neutrons
d. protons

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 number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

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