What are the atomic number and mass number for the fluorine isotope with 10 neut

Question

What are the atomic number and mass number for the fluorine isotope with 10 neutrons?

What the symbol for the fluorine isotope with 10 neutrons?

How many protons and neutrons are present in an atom of 40/18Ar?

In Millikan’s experiment, the oil droplets acquire one or more negative charges by combining with the negative charges that are produced from the ionization of air by X rays. By measuring the charges on the oil droplets, he calculated the charge on a single electron as 1.60×1019 C. The charge on any negatively charged oil droplet is always a whole-number multiple of the fundamental charge of a single electron.

If Millikan was measuring the charge on an oil droplet with 7 negatively charged electrons on it, what charge would he have measured on the droplet?

Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

Q.1) Flouride atomic number = 9, so proton number is 9 and given it has 10 neutrons so mass number is 19

Q.2) Symbol for flouride isotope with 10neutrons is    919F or 9F19

Q.3) Given 1840Ar so , proton number = atomic number = 18 ,

                                    neutrons = mass number - atomic number = 40 - 18 = 22

Q.4) From Mullikan oil drop experiment Q = ne

Q = charge on oil drop

n = number of electrons

e = charge of electron = - 1.6 x 10-19coulombs

Now Q = 7x (-1.6x -19) = - 11.2 x 10-19 coulombs

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