Which symbol represents a particle that has the same total number of electrons as s2-?
a)o2-
b)si
c)se2-
d)ar

The correct answer is D) Ar

The answer is b carbon-14. the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years. potassium-40 is used to date 1.25 billion years

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.