Examlex
The nucleus of an electrically neutral iron atom contains 26 protons.How many electrons does this iron atom have?
Volume
A measurement of the amount of space an object or substance occupies, often measured in liters, cubic meters, or gallons.
Mass
An evaluation of how much material an object holds, commonly measured in kilograms or grams.
Chemical Sample
A chemical sample refers to a small, specifiable amount of substance or material taken for analysis, testing, or study to understand its composition or properties.
Density
A measure of mass per unit volume of a substance or object.
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