The atomic number of an element is 23, and its mass number is 56.

  • (a) How many protons and electrons does an atom of this element have?

    • Protons: The atomic number is 23, so it has 23 protons.

    • Electrons: In a neutral atom, the number of electrons equals the number of protons, so it has 23 electrons.

  • (b) How many neutrons does this atom have?

    • Neutrons = Mass number – Atomic number = 56 – 23 = 33 neutrons.

Related Questions:

  1. The electronic configurations listed below are incorrect. Explain the mistakes in each and write the correct electronic configurations.
  2. Draw Bohr’s Model for the following atoms, indicating the locations of electrons, protons, and neutrons:
  3. Write the electronic configuration for the following elements:
  4. State the importance and uses of isotopes in various fields of life.
  5. Distinguish between shell and sub-shell.
  6. Why is an atom electrically neutral?
  7. How many sub-shells are there in the N shell?
  8. Give notation for sub-shells of the M shell.
  9. List the sub-shells of the M shell in order of increasing energy.
  10. Which orbital in each of the following pairs is lower in energy?
  11. Discuss the role of geochemistry and astrochemistry in understanding Earth and space.
  12. Describe the principles of green chemistry and how they help in environmental protection.
  13. Can you write the formula of the carbon dioxide gas that we exhale?
  14. Define element, compound, and mixture.
  15. Differentiate between a compound and a mixture.
  16. Differentiate between a concentrated and a dilute solution.
  17. Define the term allotropes and explain the allotropes of carbon.
  18. What is the difference between a homogeneous and a heterogeneous solution?
  19. Differentiate between colloids and suspensions.
  20. How can you identify a solvent and a solute?