The Big Bang theory states that the universe is appropriately. Which number best completes the sentence?

A. 14 thousand years old
B. 14 million years old
C. 14 Billion years old
D. 14 trillion years old

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons