Magnesium cation has polarising power close to that of :
A
`Li^(+)`
B
`Na^(+)`
C
`K^(+)`
D
`Cs^(+)`
Text Solution
AI Generated Solution
The correct Answer is:
To solve the question "Magnesium cation has polarising power close to that of:", we will follow these steps:
### Step 1: Understand the Concept of Polarising Power
Polarising power refers to the ability of a cation to distort the electron cloud of an anion. The greater the charge and the smaller the size of the cation, the higher its polarising power.
### Step 2: Identify the Position of Magnesium in the Periodic Table
Magnesium (Mg) is located in Group 2 (alkaline earth metals) and Period 3 of the periodic table.
### Step 3: Identify the Elements in the Options
The options given are:
1. Lithium (Li) - Group 1, Period 2
2. Sodium (Na) - Group 1, Period 3
3. Potassium (K) - Group 1, Period 4
4. Cesium (Cs) - Group 1, Period 6
### Step 4: Determine the Diagonal Relationship
Magnesium (Mg) has a diagonal relationship with Lithium (Li). This means that the properties of Mg are similar to those of Li due to their positions in the periodic table.
### Step 5: Compare the Polarising Powers
- Lithium (Li) is a small cation with a +1 charge, which gives it significant polarising power.
- Magnesium (Mg²⁺) is also a small cation but with a +2 charge, which enhances its polarising power.
- The polarising power of Mg²⁺ is more similar to that of Li⁺ than to the other options (Na⁺, K⁺, Cs⁺) because they are larger and have lower charge density.
### Step 6: Conclusion
Based on the diagonal relationship and the comparison of polarising powers, we conclude that the magnesium cation has polarising power close to that of lithium.
### Final Answer
Magnesium cation has polarising power close to that of **Lithium (Li)**.
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Which of the alkali metals has the polarizing power close to that of Magnesium ?
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