Identify the INCORRECT order for the number of valence shell electrons.

Correct option is B

The correct answer is (B) ​Al<P<Si<S<Cl

1. Aluminum (Al):

• Atomic number: 13
• Valence shell: The outermost shell is the third shell (n=3).
• Al (Aluminum): 3 valence electrons.

2. Phosphorus (P):

• Atomic number: 15
• Valence shell: The outermost shell is the third shell (n=3).
• P (Phosphorus): 5 valence electrons.

3. Silicon (Si):

• Atomic number: 14
• Valence shell: The outermost shell is the third shell (n=3).
• Si (Silicon): 4 valence electrons.

4. Sulfur (S):

• Atomic number: 16
• Valence shell: The outermost shell is the third shell (n=3).
• S (Sulfur): 6 valence electrons.

5. Chlorine (Cl):

• Atomic number: 17
• Valence shell: The outermost shell is the third shell (n=3).
• Cl (Chlorine): 7 valence electrons.

Information Booster:

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Valence Cell:     

• ​This term is not commonly usedin chemistry. However, if you meanvalence shell, it refers to theoutermost shellof an atom, where the valence electrons are located. These electrons play a key role in chemical reactions.

Valence Electron:

•  The electrons in the outermost shell of an atom. These are the electrons involved in forming bonds with other atoms during chemical reactions.

Valency:

•  Valency refers to the combining capacity of an atom. It indicates how many electrons an atom can gain, lose, or share when it bonds with other atoms to form compounds. For example:

Hydrogen has a valency of 1 (it can form one bond).

Oxygen has a valency of 2 (it can form two bonds).