Multiple Choice
How many valence electrons does helium (He) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following best describes an atom's valence electrons?
A
Only the electrons involved in forming ionic bonds
B
The electrons in the outermost energy level of an atom
C
The electrons in the innermost energy level of an atom
D
All electrons present in the atom
Verified step by step guidance1
Understand that valence electrons are the electrons that participate in chemical bonding and determine the chemical properties of an element.
Recall that electrons in an atom are arranged in energy levels or shells, with the outermost shell being the highest energy level occupied by electrons.
Recognize that valence electrons are specifically those electrons located in the outermost energy level of an atom, not the inner shells.
Note that valence electrons can be involved in forming both ionic and covalent bonds, so they are not limited to only ionic bonding.
Conclude that the best description of valence electrons is: the electrons in the outermost energy level of an atom.
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