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Be 2 + ^{2+} 2 + is isoelectronic with which of the following ions?
easy
Classification of Elements and Periodicity in Properties
2014
chemistry
Explanation To determine which ion is isoelectronic with Be 2 + , ^{2+}, 2 + , we need to understand the concept of isoelectronic species. \\
Isoelectronic species are atoms or ions that have the same number of electrons. \\
First, let's find the number of electrons in Be 2 + : ^{2+}: \\
2 + :
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• Beryllium (Be) has an atomic number of 4, which means it has 4 electrons in its neutral state.
• The ion
Be
has lost 2 electrons, so it has
electrons.
Now, let's analyze each option to find the number of electrons in each ion:
Option 1:
H
• Hydrogen (H) has an atomic number of 1, so it has 1 electron in its neutral state.
• The ion
H
has lost 1 electron, so it has
electrons.
Option 2:
Li
• Lithium (Li) has an atomic number of 3, so it has 3 electrons in its neutral state.
• The ion
Li
has lost 1 electron, so it has
electrons.
Option 3:
Na
• Sodium (Na) has an atomic number of 11, so it has 11 electrons in its neutral state.
• The ion
Na
has lost 1 electron, so it has
11 − 1 = 10 11 - 1 = 10 11 − 1 = 10 electrons.
Option 4:
Mg
• Magnesium (Mg) has an atomic number of 12, so it has 12 electrons in its neutral state.
• The ion
Mg
has lost 2 electrons, so it has
12 − 2 = 10 12 - 2 = 10 12 − 2 = 10 electrons.
Comparing the number of electrons:
•
Be
has 2 electrons.
•
Li
also has 2 electrons.
Therefore,
Be
is isoelectronic with
Li
The correct option is Option 2.