Question

Pair of ions with similar ionic radii and answer is lithium + and magnesium + 2 with reason

Answer 1

Answer:

It is aluminium

Explanation:

Answer 2

Pair of ions with similar ionic radii is Li+ and Mg2+.

• Lithium is an alkali metal whereas Magnesium is alkaline earth metal.
• Oxides of both the metals are basic and basicity increases down the group.
• Lithium is the first element of the first group of the periodic table whereas magnesium is at the second position in the second group of the periodic table.
• It means that lithium-ion and Magnesium ion are in a diagonal relationship.
• The diagonal relationship is shown by elements present in the 2nd and 3rd periods of the periodic table.
• Also, some properties of diagonally present elements are the same such as similarity in ionic radii, electronegativity etc.
• Similarly, beryllium and aluminium and boron and silicon.

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