Multiple Choice
Which group on the periodic table tends not to form ions or react with other elements?
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Periodic Table: Group Names
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The elements in group 17 of the periodic table are all called halogens. All halogens have the same:
A
physical state at room temperature
B
number of protons
C
number of valence electrons
D
atomic mass
Verified step by step guidance1
Understand that elements in the same group of the periodic table share similar chemical properties because they have the same number of valence electrons.
Recall that group 17 elements are called halogens and are located in the same vertical column of the periodic table.
Recognize that physical state at room temperature varies among halogens (e.g., fluorine and chlorine are gases, bromine is a liquid, iodine is a solid), so this is not the property they all share.
Note that the number of protons (atomic number) increases as you move down the group, so this is not the same for all halogens.
Conclude that the property all halogens share is the number of valence electrons, which is 7 for all elements in group 17.
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