Multiple Choice
In a neutral compound formed from aluminum ions (Al^{3+}) and sulfide ions (S^{2-}), what is the simplest whole-number ratio of Al ions to S ions?
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2. Atoms & Elements
Ions
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Which of the following species is isoelectronic with Ne?
A
F^−
B
Mg^2+
C
O^2−
D
Na^+
Verified step by step guidance1
Recall that 'isoelectronic' means having the same number of electrons. To determine which species is isoelectronic with neon (Ne), first find the number of electrons in a neutral neon atom.
Neon (Ne) has an atomic number of 10, so it has 10 electrons in its neutral state.
Calculate the number of electrons for each species by adjusting for their charge: for an ion, add electrons if the charge is negative, or subtract electrons if the charge is positive.
For example, for F⁻ (fluoride ion), fluorine has 9 protons, so neutral F has 9 electrons; since it has a -1 charge, it has 9 + 1 = 10 electrons.
Compare the electron counts of all species to 10 (the number of electrons in Ne) to identify which species is isoelectronic with neon.
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