Calculate the average atomic mass for the following elements.
boron has two naturally occurring isotopes.
80% of all boron is b11 (6 neutrons)
20% of all boron is b10 (5 neutrons)
average atomic mass =
closest whole number =

Explanation:

All boron isotopes have 5 protons.

B11 has 6 neutrons, so its atomic mass is:

6 (1.008664 u) + 5 (1.007276 u) = 11.0884 u

B10 has 5 neutrons, so its atomic mass is:

5 (1.008664 u) + 5 (1.007276 u) = 10.0797 u

So the average atomic mass of boron is:

0.80 (11.0884 u) + 0.20 (10.0797 u) = 10.8866 u

The closest whole number is 11.

c)red bank

explanation:

red bank is a borough in monmouth county, new jersey, incorporated in 1908 and located on the navesink river, the area's original transportation route to the ocean and other ports.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error