Problem: In a naturally occurring sample, 19.8% of boron atoms have five neutrons and 80.2% have six neutrons.What is the mass number of a boron atom containing 6 neutrons?

FREE Expert Solution

We have to determine the mass number of boron atom that contains 6 neutrons.


Recall that the symbol of an element is written is this way:

 


Atomic number (Z): 

• represents the identity of the element

• reveals the number of protons

• in a neutral element:

number of protons = number of electrons


Mass number (A)

• reveals the number of protons and neutrons

mass number = number of protons + number 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 number of a boron atom containing 6 neutrons?

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