Chemistry Periodic Table
The image shows the representation of an unknown element in the periodic table.
Based on the representation, which of the following statements about the element is true? (3 points)
|The combined number of protons plus electrons is 9.|
|The number of neutrons in an atom of the element is 10.|
|The combined mass of neutrons and electrons is 18.9984.|
|The sum of the masses of protons and electrons is 18.9984.|