The atomic number of fluorine is 9. what is the mass number of a fluorine atom with 8 neutrons?

1 answer:

8 0

Mass number is found by adding the number of protons and neutrons.So Fluorine, which has 9 protons would be added to the number of neutrons, 8. Therefore, the mass number of fluorine would be 17. Hope this helps. Have a nice day.

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Question 2 (Multiple Choice Worth 2 points)

faust18 [17]

Answer:

$\pi$ r² x h

Explanation:

A can is cylindrical in nature. Using the formula of the volume of the can, we can find this unknown volume.

The volume of cylinder is given as:

Volume of a cylinder = Area x height

Volume of a cylinder = $\pi$ r² x h

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Density = $\frac{mass}{volume}$

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2 years ago

Water is unique because

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Answer:

b. It exists in three different states at normal conditions in the Earth's atmosphere

Explanation:=

Snow, rain and water vapour can exist at normal conditions in the Earth's atmosphere.

a. is wrong. Only hydrogen and helium can escape Earth's atmosphere in significant amounts.

c. is wrong. The molecules of every substance are in motion even when it is solid.

d. is wrong. Other substances can form from a wide range of chemical processes.

e. is wrong. All substances expand when they become a gas.

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A topaz crystal has an interplanar spacing (d) of 1.36 Å (1 Å =1×10^[−10] m). Calculate the wavelength of the X-ray that should

bija089 [108]

Answer:

7.0*10-11m or 70Å

Explanation:

From Bragg's equation, w=2dsinx/n

Since all the parameters are specified in the question, we can easily go ahead to obtain the wavelength but we must convert the spacing given in angstroms to meters using the conversion factor provided as shown in the solution below: