I think D?? I apologize if not-check in other answers to be sure ^^
Explanation:
option option B is the correct answer of given statement helium-4(He)=2
Answer:
Neutral atoms of each element contain an equal number of protons and electrons. The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number.
Explanation:
