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Which of the following is isoelectronic ...

Which of the following is isoelectronic ?

A

`CO_2 , NO_2`

B

`NO_2^(-) , CO_2`

C

`CN^(-), CO`

D

`SO_2 , CO_2`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given pairs is isoelectronic, we need to find out the total number of electrons in each species. Isoelectronic species have the same number of electrons. Let's analyze each option step by step. ### Step 1: Understand Isoelectronic Species Isoelectronic species are atoms, ions, or molecules that have the same number of electrons. ### Step 2: Calculate the Total Electrons for Each Species We will calculate the total number of electrons for each of the given options. 1. **CO2 (Carbon Dioxide)** - Carbon (C) has an atomic number of 6, contributing 6 electrons. - Oxygen (O) has an atomic number of 8, and since there are 2 oxygen atoms, they contribute 8 × 2 = 16 electrons. - Total electrons in CO2 = 6 + 16 = 22 electrons. 2. **NO2 (Nitrogen Dioxide)** - Nitrogen (N) has an atomic number of 7, contributing 7 electrons. - Oxygen (O) has an atomic number of 8, and with 2 oxygen atoms, they contribute 8 × 2 = 16 electrons. - Total electrons in NO2 = 7 + 16 = 23 electrons. 3. **NO2- (Nitrite Ion)** - Nitrogen (N) has 7 electrons. - Oxygen (O) has 8 electrons, and with 2 oxygen atoms, they contribute 8 × 2 = 16 electrons. - The negative charge (-) adds 1 electron. - Total electrons in NO2- = 7 + 16 + 1 = 24 electrons. 4. **CN- (Cyanide Ion)** - Carbon (C) has 6 electrons. - Nitrogen (N) has 7 electrons. - The negative charge (-) adds 1 electron. - Total electrons in CN- = 6 + 7 + 1 = 14 electrons. 5. **CO (Carbon Monoxide)** - Carbon (C) has 6 electrons. - Oxygen (O) has 8 electrons. - Total electrons in CO = 6 + 8 = 14 electrons. 6. **SO2 (Sulfur Dioxide)** - Sulfur (S) has an atomic number of 16, contributing 16 electrons. - Oxygen (O) has 8 electrons, and with 2 oxygen atoms, they contribute 8 × 2 = 16 electrons. - Total electrons in SO2 = 16 + 16 = 32 electrons. ### Step 3: Compare the Total Electrons Now, we compare the total number of electrons in each pair: - CO2: 22 electrons - NO2: 23 electrons - NO2-: 24 electrons - CN-: 14 electrons - CO: 14 electrons - SO2: 32 electrons ### Step 4: Identify Isoelectronic Species From our calculations, we see: - CN- and CO both have 14 electrons. Thus, the isoelectronic pair is **CN- and CO**. ### Conclusion The answer is **CN- and CO**. ---
To determine which of the given pairs is isoelectronic, we need to find out the total number of electrons in each species. Isoelectronic species have the same number of electrons. Let's analyze each option step by step. ### Step 1: Understand Isoelectronic Species Isoelectronic species are atoms, ions, or molecules that have the same number of electrons. ### Step 2: Calculate the Total Electrons for Each Species We will calculate the total number of electrons for each of the given options. ...
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