Answer:
11. number of protons
12. B. protons: 18 and Neutrons: 22
Step-by-step explanation:
11. The number of protons in an atom determines its elemental identity. NO TWO ELEMENTS HAVE THE SAME NUMBER OF PROTONS IN THEIR ATOMS. The number of protons in an atom is called the ATOMIC NUMBER of the element. Each element therefore has a unique atomic number.
12. B. protons: 18 and Neutrons: 22