What is the atomic number of an element?
A. number of electrons in an atom of the element.
B.number of protons in an atom of the element.
C.number of neutrons in an atom of the element.
D. the sum of the protons and neutrons.
Answer:B
What is the atomic number of an element?
A. number of electrons in an atom of the element. B.number of protons in an atom of the element. C.number of neutrons in an atom of the element. D. the sum of the protons and neutrons.