Questions and Answers
What is the total number of protons and neutrons in a sodium atom?
23
If an atom has a mass number of 40 and an atomic number of 18, how many neutrons does it have?
58
In an atom, if the number of electrons is 20, what is the most likely number of protons?
20
Why do atoms have no overall electrical charge?
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If an atom has an atomic number of 8, how many electrons does it have?
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What is the significance of the mass number in an atom?
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What defines the physical property of density?
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Why are density measurements useful for identifying substances?
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Which unit is commonly used to express mass?
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What is the formula for calculating density?
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Why are feathers less dense than bricks?
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What type of property is density known as?
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