Question

Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons?
A. 20/15 D
B. 15/20 D
C. 35/15 D
D. 15/35 D

Answer 1

Answer: C) 35/15 D
A numeric in the upper left corner of the chemical symbol stated for the atomic mass. The atomic mass is almost equal to a sum of protons and neutrons because electrons are not weighted much.
The atomic numeric is situated below on the left and stated for a number of protons.