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16. 11 protons means its atomic number is 11 so the element is ₁₁Na

17. mass number = sum of protons n neutrons = 11+12 = 23

18. 11 electrons means the configuration is 1s2 2s8 3s1

19. its an atom, not an ion cuz' no. of electrons = no. of protons so it is neutral n not charged

20. losing 1 e- will make Na +ve charge so it becomes a cation