Problem: In a naturally occurring sample, 19.8% of boron atoms have five neutrons and 80.2% have six neutrons.What is the mass of a boron atom containing 5 neutrons?

FREE Expert Solution

We’re being asked to calculate the mass of boron that contains 5 neutrons.


An element can be represented as:

Atomic number (Z): 

represents the identity of the element
reveals the number of protons
in a neutral element:

            # of protons = # of electrons

Mass number (A)

reveals the number of protons and neutrons

            mass number = # of protons + # of neutrons

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Problem Details
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 mass of a boron atom containing 5 neutrons?

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