How many protons and electrons do the following species have?
a. K⁺
b. Nec. O^2–

• A. a. K⁺ has 19 protons and 18 electrons
  b. Ne has 10 protons and 10 electrons
  c. O⁻² has 8 protons and 10 electrons
• B. a. K⁺ has 19 protons and 20 electrons
  b. Ne has 10 protons and 10 electrons
  c. O⁻² has 8 protons and 10 electrons
• C. a. K⁺ has 19 protons and 20 electrons
  b. Ne has 10 protons and 10 electrons
  c. O⁻² has 8 protons and 6 electrons
• D. a. K⁺ has 18 protons and 19 electrons
  b. Ne has 8 protons and 8 electrons
  c. O⁻² has 8 protons and 10 electrons

Answer: (A)