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miss Akunina [59]
3 years ago
15

Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137 is 30.2 years. How much tim

e is required for the activity of a sample of cesium-137 to fall to 8.32 percent of its original value
Chemistry
1 answer:
Aleonysh [2.5K]3 years ago
5 0

Answer:

la primera va con la última

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As an electron gains energy, it becomes excited and jumps to a lower energy level?
Maru [420]

Yes if you add an energy to an electron the electron will become excited, and it will jump to its highest level then go back down releasing  energy


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3 years ago
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Ulleksa [173]
<span>You can answer this question by getting the atomic number and atomic mass of Oxygen from a periodic table. There you will find that the atomic number is 8, that means, by definition, that it has 8 protons. This is, because atomic number is defined as the number of protons of an element. Given that the atom is neutral, that implies that the atoms have the same number of electrons than protons. So you already know that the oxygen atoms has 8 protons and 8 electrons. The number of neutrons can vary, which is what defines the isotopes. Given that the atomic mass of oxygen is 15.999, that means that most atoms of oxygen has 8 neutrons (8 protons +8 neutrons = 16 atomic mass). But you can not be sure that a specific atom of oxygen has 8 neutrons, nevertheless, given that the other options are discarded (because they do not have 8 protons and 8 electrons), the only correct answer is the option A. 8 protons, 8 electrons, and 8 neutrons.</span>
8 0
3 years ago
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Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
marysya [2.9K]

Answer:

option A

Explanation:

hope it helps

4 0
2 years ago
A(n) _____ reaction is a reaction in which an acid and a base react in an aqueous solution to produce a salt and water.
UkoKoshka [18]
<span>A neutralization reaction is a reaction in which an acid and a base react in an aqueous solution to produce a salt and water. An example of a neutralization reaction is the reaction of sodium hydroxide and hydrogen chloride to form sodium chloride and water. Answer is C.</span>
8 0
3 years ago
What was used to fill thermometers before mercury? magma bourbon brandy helium
Tasya [4]

Answer:brandy was used to tell the temperature.May 7, 2013

Explanation:

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