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photoshop1234 [79]
3 years ago
11

Plz Help I have One more time To retake and I can't fail it..​

Chemistry
1 answer:
navik [9.2K]3 years ago
4 0

Answer:

A

Explanation:

I think the answer would be A

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How many moles are in 23.4 g
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What's the momentum of a 3.5-kg boulder rolling downhill at 5 m/s? A. 17.5 km·m/s B. 70 kg·m/s C. 8.5 kg·m/s D. 14.3 kg·m/s
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Hey There!:


p = m * V


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An atom of an element has 54 protons. Some of the elements atoms have 77 neutrons, while other atoms have 79 neutrons. What are
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Answer:

The atomic numbers of both are 54 while the mass numbers are 131 and 133 respectively.

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- On the other hand, mass number is the sum of protons and neutrons

So, if type 1 has protons = 54 and neutrons = 77: mass number = 54 + 77 = 131

if Type 2 has protons = 54 and neutrons = 79: mass number = 54 + 77 = 133

(Since the possibility of atoms of the same element to have different mass numbers but the same atomic number is called isotopy). The two types of atoms with mass numbers 131 and 133 described are isotopes.

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