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On the Periodic Table it is the number on the bottom of the element.

If you know the amount of neutrons you can add it to the number of protons to find the Atomic Mass NUMBER, which is a good approximate of the atomic mass.

Potassium (isotope 39), 19K(39), has 19 protons and 20 neutrons

19 + 20 = 39 atomic mass NUMBER, its atomic mass is 39.10 a.m.u.

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Q: How do you find out the atomic mass of an element?
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How do you find the atomic mass of magnesium?

The atomic mass of every element is given in the box for that element in the periodic table of elements.


What is a reasonable value for the atomic mass of the missing element in the periodic table?

The atomic mass of an element is found on the periodic table. It is the weighted average mass of all the isotopes of that element. Without more information, it's not possible to provide a specific value for the missing element's atomic mass.


A element box contains the name atomic number and what else?

In an element box, you will typically find the element's symbol, atomic number, atomic mass, and sometimes its electron configuration.


Do you need atomic number to find atomic mass?

No, you do not need the atomic number to find the atomic mass of an element. The atomic mass is the weighted average of the masses of the isotopes of an element, whereas the atomic number is the number of protons in the nucleus.


What element is used to find the atomic mass of all the elements?

The element used to find the atomic mass of all elements is the mole. Atomic mass is measured in atomic mass units (amu), which is based on the carbon-12 isotope. The atomic mass of an element is the weighted average of the masses of its isotopes relative to the carbon-12 standard.


What is the atomic mass of an element the number?

We can find Atomic Mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.


What is the atomic mass for magnesiam?

The atomic mass of magnesium is approximately 24.305 amu (atomic mass units).


How do you find the number of neutrons in a element using only mass and the element name?

To find the number of neutrons in an element, subtract the atomic number (number of protons) from the atomic mass number (rounded mass of the element). The atomic number can be determined from the element's position on the periodic table.


How can you fine the mass of mole of atoms of atoms of an element in grams?

To find the molar mass of an element in grams, you can look up the atomic mass of the element on the periodic table. This atomic mass is the mass of one mole of atoms of that element in grams.


Which element has the atomic mass of 126.9045?

The element is Iodine (I). It has an atomic mass of about 126.9.


Which element has a greater atomic mass A or B?

Element A has a greater atomic mass than element B if the atomic mass value of A is higher. The atomic mass represents the average mass of an element’s isotopes based on their abundance in nature.


What would you do if you wanted to know the number of neutrons in an atom of a given element?

To find the number of neutrons in an atom of a given element, you would typically subtract the atomic number (number of protons) from the atomic mass of the element. The atomic mass is usually represented as the decimal number on the periodic table for each element.