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Which of these pairs of elements have the same number of valence el O Hydrogen (H) and helium (He) O Sodium (Na) and potassium (K) O Carbon (C) and oxygen (0) O Boron (B) and beryllium (Be)
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Which of these pairs of elements have the same number of valence el

O Hydrogen (H) and helium (He)
O Sodium (Na) and potassium (K)
O Carbon (C) and oxygen (0)
O Boron (B) and beryllium (Be)

User Miraage
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Sodium (Na) Potassium(K)
User Paralife
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