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:
Mass number (A)
• reveals the number of protons and neutrons
What is the mass number of a boron atom containing 6 neutrons?
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