Textbook Question
For each ion, identify the neutral atom that is isoelectronic with it.
a. Cl−
b. Sc3+
c. Fe2+
d. Zn2+
e.Sn4+
2. Atoms & Elements
Ions
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What neutral atom is isoelectronic with Fe²⁺?
A
Co
B
Ni
C
Cr
D
Mn
Verified step by step guidance1
Understand the concept of isoelectronic species: Isoelectronic species have the same number of electrons. To find an atom that is isoelectronic with Fe²⁺, we need to determine the number of electrons in Fe²⁺.
Determine the electron count for Fe²⁺: Iron (Fe) has an atomic number of 26, which means it has 26 electrons in its neutral state. When it loses 2 electrons to form Fe²⁺, it has 24 electrons.
Identify the neutral atom with 24 electrons: Look for an element on the periodic table with an atomic number of 24, as this will have 24 electrons in its neutral state.
Locate the element with atomic number 24: Chromium (Cr) has an atomic number of 24, meaning it has 24 electrons in its neutral state.
Conclude that Cr is isoelectronic with Fe²⁺: Since Cr has 24 electrons in its neutral state, it is isoelectronic with Fe²⁺, which also has 24 electrons.
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