Q&A for How to Find Electrons

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What if the charge has no number?

Community Answer

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

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How do I calculate the number of electrons by looking at a periodic table?

Community Answer

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.

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How do I figure out the number of valence electrons?

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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.

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What is the valence electron for oxygen?

Community Answer

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.

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What is the formula to find charges?

Community Answer

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.

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How do I know if the element is ion?

Community Answer

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

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How can I find the number of an electron?

Community Answer

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

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How many electrons are in a cup holding 250 grams of water?

Community Answer

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).

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What are valence electrons?

Community Answer

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.

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What does it mean if the charge has a plus or minus symbol?

Community Answer

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.

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What if there's a positive or negative sign but no number?

Verin

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

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How do we find the number of neutrons?

Community Answer

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.

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