Multiple Choice
Which of the following represents the valence electron configuration for the helium atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons do elements in Group 2 of the periodic table possess?
A
4
B
2
C
6
D
8
Verified step by step guidance1
Identify the group number of the elements in question. Group 2 elements are also known as the alkaline earth metals.
Recall that the group number for main group elements corresponds to the number of valence electrons. For Group 1 elements, there is 1 valence electron; for Group 2 elements, there are 2 valence electrons.
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Since Group 2 elements have their outermost electrons in the s-orbital of their highest energy level, they have exactly 2 valence electrons.
Therefore, the number of valence electrons for elements in Group 2 is 2.
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