Multiple Choice
What is the net charge of an ion that has 11 protons and 10 electrons?
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2. Atoms & Elements
Ions
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Which of the following ions is isoelectronic with krypton?
A
Cl^-
B
Rb^+
C
Br^-
D
Sr^{2+}
Verified step by step guidance1
Recall that isoelectronic species have the same number of electrons. To determine which ion is isoelectronic with krypton, first find the number of electrons in a neutral krypton atom.
Krypton (Kr) has an atomic number of 36, which means a neutral krypton atom has 36 electrons.
Next, calculate the number of electrons for each ion by adjusting the number of electrons based on their charge: for anions, add electrons equal to the charge magnitude; for cations, subtract electrons equal to the charge magnitude.
For example, for Cl⁻ (chloride ion), chlorine has 17 electrons, and since it has a -1 charge, it gains 1 electron, totaling 18 electrons. Repeat this for Rb⁺, Br⁻, and Sr²⁺.
Compare the total electrons of each ion to 36 (the number of electrons in krypton). The ion with 36 electrons is isoelectronic with krypton.
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