Multiple Choice
Which ions are present in solid sodium chloride (NaCl)?
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2. Atoms & Elements
Ions
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Which atom has the same number of electrons as a P^{3-} ion?
A
Cl
B
Ar
C
K
D
S
Verified step by step guidance1
Identify the number of electrons in the P^{3-} ion. Start by determining the atomic number of phosphorus (P), which is 15, meaning a neutral phosphorus atom has 15 electrons.
Since the ion is P^{3-}, it has gained 3 extra electrons. Calculate the total electrons by adding 3 to the atomic number: 15 + 3 = 18 electrons.
Next, determine which neutral atom among the options has 18 electrons. Recall that the atomic number corresponds to the number of electrons in a neutral atom.
Check the atomic numbers of the given elements: Cl (17), Ar (18), K (19), and S (16). The atom with 18 electrons is Argon (Ar).
Conclude that the P^{3-} ion has the same number of electrons as the neutral Argon atom, making Ar the correct answer.
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