Multiple Choice
Aluminum is a Group 3A metal. Which ion does Al typically form?
1
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2. Atoms & Elements
Ions
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Which ion is represented by the following information? p+ = 12, n = 14, e- = 10
A
Mg
B
Mg^{+}
C
Mg^{2+}
D
Al^{2+}
Verified step by step guidance1
Identify the element by the number of protons (p+). Since the number of protons is 12, the element is magnesium (Mg), because the atomic number of Mg is 12.
Determine the number of neutrons (n) to find the isotope. Here, neutrons are 14, so the isotope is magnesium-26 (since 12 protons + 14 neutrons = 26).
Compare the number of electrons (e-) to the number of protons to find the charge. There are 10 electrons but 12 protons, so the ion has lost 2 electrons.
Calculate the charge of the ion using the formula: charge = number of protons - number of electrons, which gives 12 - 10 = +2.
Write the ion symbol with the charge: since it is magnesium with a +2 charge, the ion is represented as $Mg^{2+}$.
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