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choli [55]
2 years ago
14

According to the video, what qualities do Chemists need? Check all that apply. curiosity ability to focus on details ability to

lift heavy objects negotiation skills friendly attitude painstaking follow-through
Chemistry
1 answer:
tekilochka [14]2 years ago
5 0
Curiosity, ability to focus on detail, and painstaking follow-throw (i think, not really sure on the last one)
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The isotope of an atom containing 31 protons and 39 neutrons suddenly has two neutrons added to it.
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Answer:

Gallium-72

Explanation:

The elements are identified by the number of protons of the atom, which is its atomic number.

In this case the number of protons 39 (atomic number 39) permit you to identify the element as gallium.

Now, to identify the isotope you tell the name of the element and add the mass number.

The mass number is the sum of the protons and the neutrons

In this case, the number of neutrons is the original 39 plus the 2 added suddenly, i.e. 39 + 2 = 41, so the mass number is 31 + 41 = 72

Therefore, the isotope is gallium - 72.

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What is the mass number of an atom that has 12 neutrons and 11 protons?
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Mass number = protons + neutrons. 12 + 11 = 23.
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From his experiments, J. J. Thomson concluded that cathode ray particles can move at very fast speeds. cathode ray particles can
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Answer:atoms contain small negatively charged particles that are called electrons

Explanation:

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What would you expect from an endothermic reaction?
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