Q&A for How to Find Electrons

If the charge has no number (is 0), then the number of electrons is the same as the number of protons.

It is the atomic number. However, if it has positive ion, then this electron number will go down (ie +2 charge means two electrons have been lost, so the electron/atomic number will go down by two) and vice versa.

Valence electrons are the electrons contained in the outermost shell. If you look at the periodic table and at the period numbers, that is the number of valence electrons. If the number is larger than 10, subtract 10 so you get two valence electrons. Example: Oxygen is in the 16th period. If we subtract 10 from 16, we get 6; therefore, oxygen has six valence electrons.

Oxygen is in the 16th period. If we subtract 10 from 16, we get six, which is the number of valence electrons. We do this for elements in periods 11 through 16. For periods 1 through 10, the number of valence electrons is the number of the period in which they are in.

Q=ne where q is i coulomb of charge, n is no of electrons, and e is the charge of electron which is 1.6*10-19.

If the element has a charge on it, it is an ion.

You would need to add 1 for each element. For example, hydrogen has 1 electron so you would add 1+ 1=2.

To get from grams to electrons, you have to convert grams to moles by dividing by molar mass; then, you have to convert the moles into molecules by multiplying by Avagadro's number (6.02e23). As each water molecule has ten electrons, you multiply the number of molecules you have by 10. In 250 grams of water, there are approximately 13.87 moles of water (found by dividing 250 by 18.02). Therefore, there are 8.35e24 molecules of water and finally 8.35e25 electrons (after multiplying the molecules by 10).

If an element is negatively charged, you calculate the number of electrons by subtracting the negative charge from the number of protons. Since the charge is negative, this effectively means adding the absolute value of the charge. For example, if an element has 8 protons and a -3 charge, you would calculate 8 - (-3) = 8 + 3 = 11 electrons.

The number of protons in an element is equal to its atomic number. For instance, oxygen has 8 protons because its atomic number is 8.

11. In an atom's neutral state, its protons always equal the electrons.

Atomic mass - atomic number = Neutrons

The number of electrons in an atom of an element is determined by its atomic number. The atomic number of silver (Ag) is 47. Therefore, a neutral atom of silver has 47 electrons.

The periodic table shows the atomic number and the atomic mass of each element. Subtract the atomic number from the atomic mass of a given element. The difference (rounded down to the nearest whole number) is the number of neutrons in that atom.

Having a symbol but no number means that the charge is assumed to be +- 1. 🙂

If the charge has a plus symbol, then that means it has a positive charge. For a negative sign, that means it has a negative charge.

A valence electron is an electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms. In a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.