1 answer:
Answer: A) Sodium Na and Magnesium Mg
Explanation:
In the period table, you can see that Sodium (group 1) has 11 protons, and Magnesium (group 2) has 12 protons. 11+12=23 protons
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B
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1 x 10^-7 or 7
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<span>he introduced his law of triads. each triad was a group of three elements</span>
