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3 cards from this section. Quick, good the night before a test.
What is a proton?
Think about what charge it has.
Define an atom.
What is the fundamental building block of matter?
What does the atomic number represent?
Think about what identifies an element.
True or False: Isotopes of an element have different atomic numbers.
Focus on the definition of isotopes.
An unknown element has 9 protons and 10 neutrons. Identify the element and its mass number.
Refer to the periodic table for element identification.
An atom has an atomic number of 15 and a mass number of 31. How many neutrons does it have?
Think about how to derive neutrons from the given numbers.
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