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Julli [10]
4 years ago
13

How many valence electrons are in Tc

Chemistry
1 answer:
mixer [17]4 years ago
3 0
Tc is Technetium, and it has an atomic number of 43. Its atomic configuration is [Kr] 5s(1) 4d(5) [I'm on my phone so I can't do numbers on shoulders, pretend that 1 and 5 are on the s and d's shoulder]
The outside most ring is the 4d(5), and the d orbital can hold ten electrons.
Valence electrons are electrons, in you could say the outside ring that isn't filled, the extra ones. In this case, there are 5.
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Explanation:

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3 0
3 years ago
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Which of the following is an element?
Kryger [21]

Oxygen is a chemical element with symbol O and atomic number 8. Classified as a nonmetal, Oxygen is a gas at room temperature.

8 0
3 years ago
Help asap
lorasvet [3.4K]

A suitable hypothesis might be that temperature affects the rate of chemical modification, and the independent variable is temperature.

<h3>What is a hypothesis?</h3>

A hypothesis is a given explanation about a question that emerged by observing  form the real world.

In this case, the dependent variable is the rate of chemical modification because this variable is modified in the experiment.

In conclusion, a suitable hypothesis might be that temperature affects the rate of chemical modification, and the independent variable is temperature.

Learn more about the hypothesis here:

brainly.com/question/11555274

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2 years ago
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djverab [1.8K]

Answer:

All of the above

Explanation:

Exothermic reactions release energy usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen)

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