Oxygen has 13 isotopes whose half-lives are known. How does oxygen-16 differ from oxygen-18? Oxygen-16 has 8 neutrons while oxygen-10 has 18 neutrons.
Oxygen-16 has 8 protons while oxygen-18 has 10 protons.
Oxygen-16 has 16 neutrons while oxygen-18 has 18 neutrons.
Oxygen-16 has 16 protons while oxygen-18 has 18 protons.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.