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What is Atomic Mass (Easy Explanation) Video Lecture - Class 9
FAQs on What is Atomic Mass (Easy Explanation) Video Lecture - Class 9
| 1. What is atomic mass and how is it determined? |  |
Ans. Atomic mass refers to the mass of an atom, which is measured in atomic mass units (amu). It is determined by considering the sum of the masses of protons and neutrons present in the atom's nucleus. The atomic mass is usually represented as a decimal number on the periodic table.
| 2. How is atomic mass different from atomic number? | |
Ans. Atomic mass and atomic number are two different properties of an atom. Atomic mass represents the total mass of an atom, including the masses of protons, neutrons, and electrons. On the other hand, atomic number indicates the number of protons present in the nucleus of an atom, which determines its chemical properties and position in the periodic table.
| 3. Is atomic mass the same as atomic weight? | |
Ans. No, atomic mass and atomic weight are not exactly the same. Atomic mass is the mass of a single atom, while atomic weight refers to the average mass of all the isotopes of an element. Atomic weight takes into account the abundance of each isotope and is usually a decimal number on the periodic table.
| 4. Why is atomic mass usually not a whole number? | |
Ans. Atomic mass is often not a whole number because it considers the existence of isotopes. Isotopes are atoms of the same element with different numbers of neutrons. Since different isotopes have different masses, the atomic mass is calculated as the weighted average of the masses of all the naturally occurring isotopes, resulting in a decimal value.
| 5. How is atomic mass useful in chemistry? | |
Ans. Atomic mass is crucial in various chemical calculations. It helps in determining the molar mass of an element, which is essential for stoichiometry and other quantitative aspects of chemistry. Atomic mass also helps in identifying the isotopic composition of an element and understanding the behavior of atoms in chemical reactions.
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Nov 24, 2024 Last updated |
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