Question

The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement concerning nitrogen?
(A) The nitrogen atom has a mass number of approximately 7 daltons and an atomic mass of 14.
(B) The nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7.
(C) The nitrogen atom has a mass number of 14 and an atomic mass of 7 grams.
(D) The nitrogen atom has a mass number of 7 grams and an atomic number of 14.
(E) The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.

Answer 1

Answer:

Statement (E) is correct.

Explanation:

Both mass number and atomic mass are integer. Both are unit less.

Atomic mass is approximately equal to mass number of an atom with an unit of daltons or amu or u.

Mass number = number of protons + number of neutrons

So mass number of N = 7 +7 =14

So, atomic mass of n atom = 14 daltons

Hence statement (E) is correct.