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max2010maxim [7]
3 years ago
13

Why didn't mendeleev use atomic number to arrange the elements?

Chemistry
1 answer:
Pepsi [2]3 years ago
8 0

The primary reason for this was that Mendeleev didn't know that atomic numbers actually existed. Atomic numbers were only discovered a period after Mendeleev's time. The use of X-rays made it possible to find the atomic number, and those had not been discovered yet. <span>
<span>The periodic table was then arranged in 1913 by Henry Moseley in an arrangement according to atomic number.</span></span>

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Veronica is taking an average of 16 height measurements in a brand-new experiment. Which term is this the best example of? repli
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Answer:

repetition

Explanation:

Taking an average of 16 height measurements is an example of repetition. Repetition involves making and taking repeated measurements in an experiment.

The goal is to achieve a highly accurate and precise data from the experiment.

  • Replication involves duplicating another experiment and testing to see how valid they are.
  • Since Veronica's experiment is a brand new one, it's hypothesis has not been tested or replicated in any way.
  • Therefore, it is not a replication.
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3 0
3 years ago
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Answer:

Explanation:

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also, t half life = \frac{In2}{k} where k is rate constant

k = \frac{In 2}{45 days} = 0.0154

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6 0
3 years ago
Which of the following can form a hydrogen bond with the HF molecule?
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If the plane is going 600 km/h

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