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Yuliya22 [10]
2 years ago
15

It is important to know the difference between atoms, ions, and isotopes. Choose all of the correct answers.

SAT
1 answer:
Akimi4 [234]2 years ago
8 0
The correct option is an atom of oxygen and the iron of oxygen both have 8 protons. As you add of remove neutrons from the nucleus, isotopes are formed
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When 1/2 of the number N is decrease by four, the result is -6. What is three times N added to seven?
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Answer:

5

Explanation:

Word problem.

First statememt

n/2 - 4 = -6. ....... (1)

Second statement.

3n + 7 = x. ....... (2)

From (1)

n/2 - 4 = -6.

n/2 = -6 +4

n/2 = -2

n= -4

Put n into (2).

3n + 7 = x

3(-4) +7 = x

x= -12 +7 = -5

The answer is -5.

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