Ninety-nine percent of the mass of an atom is located in
A B C D
the outermost energy level. the first energy level. the electron clouds. the nucleus.
Question: Ninety-nine percent of the mass of an atom is located in
(A) the outermost energy level.
(B) the first energy level.
(C) the electron clouds.
(D) the nucleus.

Answer: (D) the nucleus.
Answer: (B) the first energy level.
Question: Ninety-nine percent of the mass of an atom is located in
(A) the outermost energy level.
(B) the first energy level.
(C) the electron clouds.
(D) the nucleus.
Answer: (D) the nucleus.