Multiple Choice
Which process leads to the formation of an anion from a neutral atom?
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2. Atoms & Elements
Ions
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Which of the following ions is isoelectronic with Ar?
A
Cl-
B
Ca2+
C
K+
D
Na+
Verified step by step guidance1
Step 1: Understand the term 'isoelectronic'. Isoelectronic species have the same number of electrons. To find which ion is isoelectronic with Argon (Ar), we need to compare the number of electrons in each ion to that in Ar.
Step 2: Determine the number of electrons in Argon (Ar). Argon has an atomic number of 18, so it has 18 electrons in its neutral state.
Step 3: Calculate the number of electrons in each ion by adjusting for their charges:
- For Cl⁻ (chloride ion), add 1 electron to chlorine's atomic number (17 + 1 = 18 electrons).
- For Ca²⁺ (calcium ion), subtract 2 electrons from calcium's atomic number (20 - 2 = 18 electrons).
- For K⁺ (potassium ion), subtract 1 electron from potassium's atomic number (19 - 1 = 18 electrons).
- For Na⁺ (sodium ion), subtract 1 electron from sodium's atomic number (11 - 1 = 10 electrons).
Step 4: Compare the electron counts of each ion to Argon's 18 electrons. Identify which ions have exactly 18 electrons, meaning they are isoelectronic with Ar.
Step 5: Conclude which ion(s) are isoelectronic with Argon based on the electron count comparison.
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