An example of an atomic mass is approximately 23 amu for most sodium atoms.
To understand this better, let's break down what atomic mass means:
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Atomic Mass: This is the mass of an atom, typically expressed in atomic mass units (amu). It's roughly equivalent to the number of protons and neutrons in the nucleus.
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Example Breakdown: Most sodium (Na) atoms have 11 protons and 12 neutrons. Therefore, their atomic mass is approximately 11 + 12 = 23 amu. While the average atomic mass accounts for different isotopes, the most common sodium atom has an atomic mass close to 23 amu.
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Other Examples:
- Copper (Cu): Many copper atoms have about 29 protons and 34 neutrons, leading to an atomic mass of around 63 amu.
- Oxygen (O): The average atomic mass of oxygen is about 16 amu, but this is an average incorporating the various isotopes of oxygen.
In essence, atomic mass provides a way to quantify the mass of individual atoms, providing a foundation for understanding chemical reactions and properties.
