Multiple Choice
Which of the following represents a species with 39 protons and 36 electrons?
2. Atoms & Elements
Ions
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Which of the following ions are negatively charged?
A
Sodium (Na⁺)
B
Calcium (Ca²⁺)
C
Ammonium (NH₄⁺)
D
Chloride (Cl⁻)
Verified step by step guidance1
Identify the charge of each ion listed in the problem. Sodium (Na⁺), Calcium (Ca²⁺), and Ammonium (NH₄⁺) are all positively charged ions, indicated by the positive sign next to their chemical symbols.
Understand that negatively charged ions are called anions. Anions have more electrons than protons, resulting in a net negative charge.
Examine the chemical symbol for Chloride (Cl⁻). The negative sign indicates that it is an anion, meaning it has a negative charge.
Recall that the charge of an ion is determined by the difference between the number of protons and electrons. For Chloride (Cl⁻), it has gained an extra electron, giving it a negative charge.
Conclude that among the ions listed, Chloride (Cl⁻) is the only negatively charged ion, as it is the only one with a negative sign next to its chemical symbol.
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