Multiple Choice
Alkali metals, alkaline earth metals, and halogens are elements found respectively in which groups of the periodic table?
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2. Atoms & Elements
Periodic Table: Group Names
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Which element is the only metalloid with 3 valence electrons?
A
Silicon
B
Boron
C
Germanium
D
Arsenic
Verified step by step guidance1
Recall that metalloids are elements with properties intermediate between metals and nonmetals, often found along the zig-zag line on the periodic table.
Identify the group number of each element listed: Boron (B) is in group 13, Silicon (Si) in group 14, Germanium (Ge) in group 14, and Arsenic (As) in group 15.
Understand that the group number for main group elements corresponds to the number of valence electrons. For example, group 13 elements have 3 valence electrons.
Since Boron is in group 13, it has 3 valence electrons, while Silicon and Germanium (group 14) have 4 valence electrons, and Arsenic (group 15) has 5 valence electrons.
Conclude that Boron is the only metalloid among the options with exactly 3 valence electrons.
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