Problem: In a naturally occurring sample, 19.8% of boron atoms have five neutrons and 80.2% have six neutrons.What is the average mass of the atoms in the drawing?

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In a naturally occurring sample, 19.8% of boron atoms have five neutrons and 80.2% have six neutrons.

Ten boron nuclei are depicted. Eight of which (shaded dark gray) have five protons (white circles) and six neutrons (black circles), and two nuclei (shaded light gray) have five protons (white circles) and five neutrons (black circles).

What is the average mass of the atoms in the drawing?

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