Isoelectronic ions or atoms have the same number of electrons. To determine which ions or atoms are isoelectronic with Mg2+, Li+, Ar, Al3+, and B3-, we need to know the number of electrons in each.

1. Mg2+: Magnesium normally has 12 electrons, but it has lost 2 electrons to become Mg2+, so it has 10 electrons.

2. Li+: Lithium normally has 3 electrons, but it has lost 1 electron to become Li+, so it has 2 electrons.

3. Ar: Argon is a noble gas with 18 electrons.

4. Al3+: Aluminum normally has 13 electrons, but it has lost 3 electrons to become Al3+, so it has 10 electrons.

5. B3-: Boron normally has 5 electrons, but it has gained 3 electrons to become B3-, so it has 8 electrons.

So, Mg2+ and Al3+ are isoelectronic because they both have 10 electrons. None of the other ions or atoms listed are isoelectronic with each other or with Mg2+ and Al3+.

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Isoelectronic ions or atoms have the same number of electrons. To determine which ions or atoms are isoelectronic with Mg2+, Li+, Ar, Al3+, and B3-, we need to know the number of electrons in each.

1. Mg2+: Magnesium normally has 12 electrons, but it has lost 2 electrons to become Mg2+, so it has 10 electrons.

2. Li+: Lithium normally has 3 electrons, but it has lost 1 electron to become Li+, so it has 2 electrons.

3. Ar: Argon is a noble gas with 18 electrons.

4. Al3+: Aluminum normally has 13 electrons, but it has lost 3 electrons to become Al3+, so it has 10 electrons.

5. B3-: Boron normally has 5 electrons, but it has gained 3 electrons to become B3-, so it has 8 electrons.

So, Mg2+ and Al3+ are isoelectronic because they both have 10 electrons. None of the other ions or atoms listed are isoelectronic with each other or with Mg2+ and Al3+.

Knowee AI · Accepted Answer

Isoelectronic ions or atoms have the same number of electrons. To determine which ions or atoms are isoelectronic with Mg2+, Li+, Ar, Al3+, and B3-, we need to know the number of electrons in each.

1. Mg2+: Magnesium normally has 12 electrons, but it has lost 2 electrons to become Mg2+, so it has 10 electrons.

2. Li+: Lithium normally has 3 electrons, but it has lost 1 electron to become Li+, so it has 2 electrons.

3. Ar: Argon is a noble gas with 18 electrons.

4. Al3+: Aluminum normally has 13 electrons, but it has lost 3 electrons to become Al3+, so it has 10 electrons.

5. B3-: Boron normally has 5 electrons, but it has gained 3 electrons to become B3-, so it has 8 electrons.

So, Mg2+ and Al3+ are isoelectronic because they both have 10 electrons. None of the other ions or atoms listed are isoelectronic with each other or with Mg2+ and Al3+.

Which ions or atoms are isoelectronic with Mg2+Li+ArAl3+B3-

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