ASAP
Why do elements within a period of the periodic table have different
properties?
A. They have different arrangements of core electrons.
B. They have different numbers of valence electrons.
C. Some are metals and some are nonmetals.
D. They have different combinations of protons and neutrons.

Elements within the same period have different numbers of electrons in their valence shells from left to right and different electron configurations. Thus, all elements in the same period are chemically different from each other.

Hence, option B is correct.

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ASAP Why do elements within a period of the periodic table have different properties? A. They have different arrangements of core electrons. B. They have different numbers of valence electrons. C. Some are metals and some are nonmetals. D. They have different combinations of protons and neutrons.

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ASAP
Why do elements within a period of the periodic table have different
properties?
A. They have different arrangements of core electrons.
B. They have different numbers of valence electrons.
C. Some are metals and some are nonmetals.
D. They have different combinations of protons and neutrons.