Multiple Choice
Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons?
2. Atoms & Elements
Ions
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Which of the following has 10 electrons?
A
19F–
B
23Na+
C
27Al3+
D
16O2–
E
20Ne
F
All of the above have 10 electrons.
Verified step by step guidance1
Identify the atomic number of each element, which represents the number of protons and, in a neutral atom, also the number of electrons. For example, Fluorine (F) has an atomic number of 9, Sodium (Na) has 11, Aluminum (Al) has 13, Oxygen (O) has 8, and Neon (Ne) has 10.
Consider the charge of each ion. A negative charge indicates the addition of electrons, while a positive charge indicates the removal of electrons. For example, F– has gained 1 electron, Na+ has lost 1 electron, Al3+ has lost 3 electrons, and O2– has gained 2 electrons.
Calculate the total number of electrons for each ion by adding or subtracting the charge from the atomic number. For instance, F– has 9 + 1 = 10 electrons, Na+ has 11 - 1 = 10 electrons, Al3+ has 13 - 3 = 10 electrons, and O2– has 8 + 2 = 10 electrons.
Verify the electron count for the neutral atom, Neon (Ne), which has an atomic number of 10, meaning it naturally has 10 electrons.
Conclude that all the given species (F–, Na+, Al3+, O2–, and Ne) have 10 electrons, confirming the statement that all of the above have 10 electrons.
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