We’re being asked to determine the number of protons, neutrons, and electrons in a 55Mn2+ ion.
An element can be represented as:
You can determine the identity of the element using its atomic number:
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
How many protons, neutrons and electrons are in 55Mn2+?
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