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Which two elements will be the most alike and why? a. Helium (He) and Hydrogen (H) b. Oxygen (O) and Neon (Ne) c. Lithium (Li) and Sodium (Na)
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Which two elements will be the most alike and why?

a. Helium (He) and Hydrogen (H)
b. Oxygen (O) and Neon (Ne)
c. Lithium (Li) and Sodium (Na)

User Tomsp
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C.) Lithium (Li) and Sodium (Na)

Because they are in the same group (vertical rows) which means they have the same number of valence electrons and will react similarly.
User RandyLahey
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