2. Essential Chemistry for Biology

How many valence electrons does an atom with five total electrons have?

How many electrons does an Oxygen atom need to fulfill the octet rule by filling its valence shell?

A proton ___________:

What is TRUE about carbon-13 and carbon-14?

The isotope Carbon-14 has a half-life of 5,730 years. How many years must pass for a sample of Carbon-14 to break down to ¼ of its original amount?

The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:

The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than nitrogen-14 because the atomic nucleus of nitrogen-15 contains ________.

How are Carbon-13 and Nitrogen-15 respectively different from the more abundant isotopes Carbon-12 and Nitrogen-14? Carbon-13 and Nitrogen-15 _______________:

A neon atom (Ne) is unreactive for which of the following reasons?

Which of the following is true about electron energy shells?