Table of contents

1. The Chemical World9m
- The Scientific Method
  9m
2. Measurement and Problem Solving2h 19m
3. Matter and Energy2h 15m
4. Atoms and Elements2h 33m
5. Molecules and Compounds1h 50m
6. Chemical Composition1h 23m
7. Chemical Reactions1h 43m
8. Quantities in Chemical Reactions1h 8m
9. Electrons in Atoms and the Periodic Table2h 32m
10. Chemical Bonding2h 10m
11 Gases2h 7m
12. Liquids, Solids, and Intermolecular Forces1h 11m
13. Solutions3h 1m
14. Acids and Bases2h 14m
15. Chemical Equilibrium1h 27m
16. Oxidation and Reduction1h 33m
17. Radioactivity and Nuclear Chemistry53m

4. Atoms and Elements

Ions (Simplified)

Introduction to Chemistry

4. Atoms and Elements

Ions (Simplified)

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Multiple Choice

Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons?

⁵⁵Mn⁴⁺

⁵¹Cl⁴⁺

⁵¹Mn⁴⁺

⁵⁸Ni⁴⁺

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Verified step by step guidance

Identify the number of protons in each element option. The atomic number of an element represents the number of protons in its nucleus.

Calculate the number of protons for each element using the atomic number: Mn (Manganese) has 25 protons, Cl (Chlorine) has 17 protons, and Ni (Nickel) has 28 protons.

Determine the number of protons for the given ion. Since the ion has 21 electrons and a +4 charge, it must have 25 protons (21 electrons + 4 positive charge = 25 protons).

Match the number of protons to the correct element. Manganese (Mn) has 25 protons, which matches the calculated number of protons for the ion.

Verify the mass number of the correct ion. The mass number is the sum of protons and neutrons. For the ion with 25 protons and 30 neutrons, the mass number is 55 (25 protons + 30 neutrons = 55). Therefore, the correct symbol is 55Mn4+.