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Answer:
answer is option three
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Answer:
Li,Na,k is correct answer
Explanation:
This triad was made up of the alkali metals lithium, sodium, and potassium.
Triad Atomic Masses
Lithium 6.94
Sodium 22.99
Potassium 39.1
The arithmetic mean of the masses of potassium and lithium corresponds to 23.02, which is almost equal to the atomic mass of sodium.
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