5. SEP Use Mathematics The mass of an isotope can be approximated by adding together the number of protons and neutrons in its nucleus. For example, a
carbon-12 nucleus has 6 protons and 6 neutrons, and its mass is approximately
12 amu. Look at the models for the two isotopes of boron. Each model shows the
isotope's natural percent abundance and the composition of its nucleus. Use the
data to calculate the approximate atomic mass of boron.
Spº
6n
2092
8092

43.452

step-by-step explanation:

284 times .153 = 43.452

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

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explanation:

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