Question 12 — If a species has 11 - Questions at the end of the chapter - Chapter 9 - Atomic Foundations of Matter (Exploration)

Last updated at July 3, 2026 by

Question 12
If a species has 11 protons, 12 neutrons and 10 electrons then (i) what is its atomic number and mass number? (ii) is it neutral, a cation or an anion? Explain. (iii) write its electronic configuration. (iv) name the species.
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  • (i) Atomic number = protons = 11 ; mass number = 11 + 12 = 23 .
  • (ii) Protons (11) > electrons (10), so it is a cation (charge +1).
  • (iii) With 10 electrons: 2, 8 .
  • (iv) It is a sodium ion, Na⁺ .
Identify the Species Atomic number 11, mass number 23 11 protons but 10 electrons It is a sodium cation Na plus
Back to: 9.4.2 Bonding by electron transfer — Ionic bond
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