Multiple Choice
Which of the following elements has two electrons in its outer p orbitals?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which element has exactly 2 valence electrons and only 1 energy level?
A
Magnesium (Mg)
B
Beryllium (Be)
C
Lithium (Li)
D
Helium (He)
Verified step by step guidance1
Understand that the number of valence electrons corresponds to the electrons in the outermost energy level (shell) of an atom.
Recognize that the number of energy levels corresponds to the principal quantum number (n), which is the number of electron shells occupied by electrons.
Identify that having exactly 2 valence electrons means the element's outermost shell contains 2 electrons.
Note that having only 1 energy level means the element's electrons are all in the first shell (n=1), which can hold a maximum of 2 electrons total.
Compare the given elements: Magnesium (Mg), Beryllium (Be), Lithium (Li), and Helium (He), and determine which has 2 valence electrons and only 1 energy level by examining their electron configurations.
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