How can you determine the number of electrons in an atom?

Answer 1

You have to know the exact identity of the material to do this.

First convert the mass of the material to the number of moles (see the Related Questions to the left for how to convert from mass to moles).

Then determine the number of total electrons in the material using the Periodic Table and also see the Related Questions for how to count electrons.

Then multiply the number of electrons times the number of moles and that times Avogadro's number (again, see the Related Questions).

So you have:

Step 1)

Mass ÷ Molecular weight = Moles of material

Step 2)

Moles * # of electrons per molecule * Avogadro's number = total # of electrons

Answer 2

* The number of electrons is equivalent to the number of protons. (unless it is an electrically unbalanced ion)

* The atomic number is the number of protons in an atom, therefore, the atomic number is the number of electrons.

* Mass number - number of neutrons = Number of protons = Number of electrons

* Number of neutrons = Atomic Mass - Number of protons (Mass number - Number of protons = Number of neutrons)

*Atomic mass is the mass of the protons + the mass of the neutrons + the mass of the electrons this cannot directly indicate the number of any of these but a large Atomic mass will entail a large number of particles.

Answer 3

The number of electrons is the same as the atomic number (and protons). So, if you look at an element on the periodic table, lets say Hydrogen. The atomic number above the element is one, so thats how many electrons there are.
Based on their atomic number in the periodic table.

Answer 4

That's kind of harder to do with just the mass, but if that's all you have, look in the periodic table. Look for the same mass (remember it's rounded to the nearest whole number, or should be) then whichever element has the same mass use it's atomic number for the protons. In other words the atomic number is the amount of protons in the element. Electrons are the same as the protons, and neutrons are found by taking the rounded mass and subtracting the protons from it. (mass-protons= neutrons)

Answer 5

To determine the amount of electrons in an element, just look at the atomic number, which can be found above the symbol.

Answer 6

Atomic number is the number of protons in the nucleus of an atom. In a neutral atom, the number of protons equals the number of electrons.

Answer 7

The atomic number of an element is the number of protons in the nucleus of an atom of that element. In a neutral atom, the number of protons is equal to the number of electrons.

Answer 8

If the atom is neutral, it has the same number of electrons as protons. However, an atom need not always be neutral.