Question

A student looks up an element on the periodic table. The table says that the atomic number of the element is 12 and the mass number of the element is 40. What information do these two numbers convey about the element?(1 point)
Responses

The element has 40 protons and 12 neutrons
The element has 40 protons and 12 neutrons

The element has 12 protons and 12 neutrons
The element has 12 protons and 12 neutrons

The element has 12 protons and has 28 neutrons
The element has 12 protons and has 28 neutrons

The element has 28 protons and 40 neutrons

Answer 1

Atomic number = number of protons = 12. Mass number = protons + neutrons = 40, so neutrons = 40 − 12 = 28.

Answer: The element has 12 protons and 28 neutrons.