Let's consider an isotope of an element X with the following atomic symbol: 42 X 20 Answer the following questions regarding that element's isotope using the dropdown on the right. What is the atomic number for [ Choose ] element X? What is the mass number for that [ Choose ] isotope of element X? What is the number of protons for [ [ Choose ] element X? What is the number of neutrons for [ Choose ] that isotope of element X? What is the number of electrons for [ Choose ] element X? What is the chemical symbol for Choose ] element X?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.