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In order for an atom to be neutral what has to be true?
Match each part of the following diagram below:
How is the number of neutrons in the nucleus of an atom calculated?
An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?
What is the atomic number of the atom pictured?
Which of the following determines the identity of an element?
What are the two main parts of the atom?
Match the following with their correct charge.