3 years ago

Help !! Just number 10 ,11 ,12 thanks!

1 answer:

6 0

10. the thing in the slide wasnt centered so the microscope magnefied on nothing 11. mive it tight 12. idk what a um is

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mihalych1998 [28]

Answer:24.31

Explanation:Contribution made by isotope of mass 23.99= 23.99×78.99=1894.97

Contribution made by isotope of mass 24.99=24.99×10.00=249.9

Contribution made by isotope of mass 25.98=25.98×11.01=286.04

Total contribution=1894.97+249.9+286.04=2430.91

Average mass=2430.91÷100

=24.31

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denis-greek [22]

Element: Boron
Symbol: B
So answer is B

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Capable of catching fire

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No of protons=107+1=108
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Mass no. =166

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