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
What is the mass of a boron atom containing 5 neutrons?
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