Which of the following represents an isotope containing 39 protons, 39 electrons, and 30 neutrons? a. Yttrium-39
X þ. Yttrium-108
C. Yttrium-78
d. Yttrium-69

A6.10 m nacl can be made by adding [x]g of nacl to a container and making the volume of water up to the 1.00 l line

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

Which of the following methods uses the decay of atomic particles in an object to find its exact age? a. fossil dating b. geologic dating c. radioactive dating d. relative dating