Multiple Choice
How many valence electrons does magnesium (Mg) have?
152
views
10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
Which of the following atoms is capable of having an expanded valence shell?
A
P (phosphorus)
B
O (oxygen)
C
C (carbon)
D
N (nitrogen)
Verified step by step guidance1
Recall that an expanded valence shell occurs when an atom can have more than 8 electrons in its valence shell, which is possible for elements in period 3 or below because they have available d orbitals.
Identify the period of each element: Carbon (C), Nitrogen (N), and Oxygen (O) are in period 2, while Phosphorus (P) is in period 3.
Understand that elements in period 2 cannot expand their valence shell beyond 8 electrons because they lack accessible d orbitals.
Recognize that Phosphorus, being in period 3, has empty 3d orbitals that can be used to accommodate more than 8 electrons, allowing it to have an expanded valence shell.
Conclude that among the given atoms, only Phosphorus (P) is capable of having an expanded valence shell.
Related Videos
Related Practice
