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Annette [7]
4 years ago
6

Oxygen-18 is a naturally-occuring, stable isotope and is commonly used is scientific studies as a tracer. Using the periodic tab

le, predict the number of electrons, neutrons, and protons in oxygen-18.
A) Oxygen-18 contains 8 electrons, 9 neutrons, and 9 protons.
B) Oxygen-18 contains 8 electrons, 10 neutrons, and 8 protons.
C) Oxygen-18 contains 6 electrons, 10 neutrons, and 8 protons.
D) Oxygen-18 contains 9 electrons, 8 neutrons, and 10 protons.
Physics
2 answers:
Viefleur [7K]4 years ago
5 0

Oxygen has Atomic number 8 so all isotopes have 8 protons and 8 electrons.

So the number of neutrons in Oxygen-18 = 18 - 8 = 10.

Option B is the correct one.


TiliK225 [7]4 years ago
4 0

Answer:

B

Explanation:

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Answer:

C) True. S increases with time, v₁ = gt and v₂ = g (t-t₀)  we see that for the same t v₁> v₂

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You have several statements and we must select which ones are correct. The best way to do this is to raise the problem.

Let's use the vertical launch equation. The positive sign because they indicate that the felt downward is taken as an opponent.

Stone 1

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    y₁ = 0 + ½ g t²

Rock2

It comes out a little later, let's say a second later, we can use the same stopwatch

     t ’= (t-t₀)

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Let's calculate the distance between the two rocks, it should be clear that this equation is valid only for t> = to

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    S = ½ g [t² - (t²- 2 t to + to²)]  

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    S = ½ g t₀ (2 t -t₀)

This is the separation of the two bodies as time passes, the amount outside the Parentheses is constant.

For t <to.  The rock y has not left and the distance increases

For t> = to.  the ratio (2t/to-1)> 1 therefore the distance increases as time

passes

Now we can analyze the different statements

A) false. The difference in height increases over time

B) False S increases

C) Certain s increases with time, v₁ = gt and V₂ = g (t-t₀) we see that for the same t   v₁> v₂

3 0
4 years ago
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