_______ was responsible for first grouping elements into triads based on similar properties.

2 answers:

7 0

German scientist Döbereiner was one responsible for grouping elements into triads based on most notably atomic mass, many of which can be found in the periodic table to be in a pattern (for example Iron Cobalt Nickel, elements 26, 27, 28)

Sonja [21]4 years ago

4 0

I had the same answer A but I wanted to make sure

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Answer:

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Explanation:

Find attached for the calculation.

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Gemiola [76]

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If a half life is 2.5 hours, how long is 2 half life's

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27. I think that's the answer

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