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2 cards from this section. Quick, good the night before a test.
What does the atomic number represent?
Think about what defines an element.
How do isotopes differ from one another?
Consider the components of the nucleus.
What is the atomic number of an element that has 11 protons?
It's the same as the number of protons.
True or False: Isotopes of an element always have the same mass number.
Focus on what makes isotopes different.
A neutral element has an atomic number of 15 and a mass number of 31. How many neutrons does it have?
Remember the formula for mass number.
If an isotope of iodine has a mass number of 127 and the atomic number is 53, how many neutrons does it have?
Use the same subtraction method as before.
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