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Multiple Choice
How are elements similar within a group (family) on the periodic table?
A
They have the same atomic number.
B
They have the same number of protons and neutrons.
C
They are all metals.
D
They have the same number of valence electrons.
Verified step by step guidance
1
Understand that elements in the same group (or family) of the periodic table share similar chemical properties because they have the same number of valence electrons.
Recall that valence electrons are the electrons in the outermost shell of an atom and are primarily responsible for chemical reactivity and bonding behavior.
Recognize that the atomic number is unique to each element and increases as you move across periods, so elements in the same group do not have the same atomic number.
Note that the number of protons defines the element, but the number of neutrons can vary (isotopes), so elements in the same group do not necessarily have the same number of neutrons.
Understand that groups can contain metals, nonmetals, or metalloids, so being all metals is not a defining characteristic of a group.