Answer:
Explanation:
The atomic mass of Magnesium (Mg) is 24.305 amu
The atomic mass of Potassium (K) is 39.0983 amu
ATOMIC MASS
Atomic mass, first of all, is the sum of the masses of the protons, neutrons and electrons in an atom. But in most cases, electrons have less mass than protons and neutrons that they don't match for the average sum of the three.
There are cases like this that's why there are three (3) ways to find an atomic mass.
THREE WAYS TO FIND ATOMIC MASS
1. Use your periodic table of elements
In most Chemistry classes, especially if it's your first, your teacher will tell you to always refer to your periodic table of elements. This is because the atomic mass or atomic weight is usually written there. Below the element's symbol.
The unit of measurement used in periodic tables are amu or atomic mass units.
2. SUM OF PROTONS AND NEUTRONS
You can also try to add the mass of protons and neutrons to get the atomic mass of an atom.
3. WEIGHTED AVERAGE FOR ALL ATOMS
If you encounter this problem, where you need to get the weighted average of all the element's isotopes, here's what you can do:
Usually provided with a list of isotopes with their mass and natural abundance;
To know more about atomic mass, read these links:
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