Which of the following do not have the s...

Which of the following do not have the same number of valence electrons?

H, Li, Na, K

He, Mg, Be, Ca

B, AI, N, P

O, S, Se

Text Solution

AI Generated Solution

The correct Answer is:

To determine which of the given options does not have the same number of valence electrons, we will analyze each option step by step. ### Step-by-Step Solution: 1. **Option A: Hydrogen, Lithium, Sodium, Potassium** - **Hydrogen (H)**: Atomic number = 1, Electronic configuration = 1. Valence electrons = 1. - **Lithium (Li)**: Atomic number = 3, Electronic configuration = 2,1. Valence electrons = 1. - **Sodium (Na)**: Atomic number = 11, Electronic configuration = 2,8,1. Valence electrons = 1. - **Potassium (K)**: Atomic number = 19, Electronic configuration = 2,8,8,1. Valence electrons = 1. - **Conclusion for Option A**: All have 1 valence electron. So, they have the same number of valence electrons. 2. **Option B: Helium, Magnesium, Beryllium, Calcium** - **Helium (He)**: Atomic number = 2, Electronic configuration = 2. Valence electrons = 2. - **Magnesium (Mg)**: Atomic number = 12, Electronic configuration = 2,8,2. Valence electrons = 2. - **Beryllium (Be)**: Atomic number = 4, Electronic configuration = 2,2. Valence electrons = 2. - **Calcium (Ca)**: Atomic number = 20, Electronic configuration = 2,8,8,2. Valence electrons = 2. - **Conclusion for Option B**: All have 2 valence electrons. So, they have the same number of valence electrons. 3. **Option C: Boron, Aluminium, Nitrogen, Phosphorus** - **Boron (B)**: Atomic number = 5, Electronic configuration = 2,3. Valence electrons = 3. - **Aluminium (Al)**: Atomic number = 13, Electronic configuration = 2,8,3. Valence electrons = 3. - **Nitrogen (N)**: Atomic number = 7, Electronic configuration = 2,5. Valence electrons = 5. - **Phosphorus (P)**: Atomic number = 15, Electronic configuration = 2,8,5. Valence electrons = 5. - **Conclusion for Option C**: Boron and Aluminium have 3 valence electrons, while Nitrogen and Phosphorus have 5 valence electrons. Thus, they do not have the same number of valence electrons. 4. **Option D: Oxygen, Sulphur, Selenium** - **Oxygen (O)**: Atomic number = 8, Electronic configuration = 2,6. Valence electrons = 6. - **Sulphur (S)**: Atomic number = 16, Electronic configuration = 2,8,6. Valence electrons = 6. - **Selenium (Se)**: Atomic number = 34, Electronic configuration = 2,8,18,6. Valence electrons = 6. - **Conclusion for Option D**: All have 6 valence electrons. So, they have the same number of valence electrons. ### Final Conclusion: The option that does not have the same number of valence electrons is **Option C: Boron, Aluminium, Nitrogen, and Phosphorus**. ---

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Which of the following have the same number of valence electrons?

N,Li,Na,C

He,Mg,Be,Ca

B,Al,N,P

O,S,Se,Rb

Which of the following set of ions have the same number of electrons ?

`Cr^(3+), Fe^(2+)`

`Cu^(+), Zn^(2+)`

`Mn^(2+), Fe^(3+)`

`Sc^(3+), V^(3+)`

Which of the following have the same number of unpaired electrons in 'd' orbitals

`Fe^(3+)`

`Co^(3+)`