The atomic number of an element is the total number of which subatomic particles in the nucleus?

The atomic number of an element is determined by the number of protons present in an atom.

Explanation:

There are 3 sub-atomic particles in an atom. They are: electrons, protons and neutrons.

Protons: They carry positive charger and are found in nucleus.Electrons: They carry negative charge and are found around the nucleus.Neutrons: They dos not carry any charge and are found in nucleus.

Atomic number is defined as the number of protons that are present in a neutral atom. It is represented as Z.

Z = Atomic number = Number of protons

Hence, the atomic number of an element is determined by the number of protons present in an atom.

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The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.