Valence electrons are the outer most shell of electrons and they have a "1-" charge (-1 means the same thing but is written 1-). All of the other electrons in the energy levels also have 1- charge. All electrons have 1- charge and all protons have a 1+.
Lithium (Li #3) has 1 valence electron and three electrons total. Charge= 3-
It also has three protons. Charge= 3+
3- + 3+ = 0; making it neutral.
The answer to your question is 1
How many valence electrons?
How many valence electrons does it take to neutralize a protons charge? I am studying acids and bases and it seems that it takes 2 which does not make sense to me. Thanks
- An atom consists of positively charged protons, electrically neutral neutrons and negatively charged electrons. At the centre of the atom, neutrons and protons stay together to form the atom’s core or nucleus. Electrons revolve around the atom’s core in three-dimensional orbits or shells.Each of these molecular orbits needs a certain number of electrons to be stable. The inner orbit closest to the core must contain 2 electrons to be stable. The second orbit must contain 8 electrons to be stable. Each subsequent orbit, for atoms that contain more than 10 protons and electrons, also requires a pre-defined number of electrons to be stable. But apart from inert gases such as helium, neon and argon, the outermost orbit of most atoms is missing one or more electrons to be stable.00
- I don't know if you understand enough about the physical structure of atoms for this answer. All atoms have electrons - one for each proton in its nucleus (you understand that the electrons orbit the nucleus, right?). Well, the presently accepted model of the construction of atoms has the electrons occurring in orbit clouds around the nucleus but at specific distances from the nucleus (called "shells") depending on how many there are for that atom. The valence electrons are the ones in the outer-most "shell" of electrons and they determine the electrical charge (if any) of the atom in question and what it's bonding ability will be (i.e. how it will react or connect to other atoms). That's as non-technical as I can say it with out getting all physics-y on you.00
- In chemistry, valence electrons are the electrons contained in the outermost, or valence, electron shell of an atom. Valence electrons are important in determining how an element reacts chemically with other elements: The fewer valence electrons an atom holds, the less stable it becomes and the more likely it is to react. The reverse is also true, the more full/complete the valence shell is with valence electrons, the more inert an atom is and the less likely it is to chemically react with other chemical elements or with chemical elements of its own type. This is because it takes more transfer of energy (photons) to lose or gain an electron from or into a shell when that shell is more complete/full.
Valence electrons have the ability like electrons in inner shells to absorb or release energy(photons). This gain or loss of energy can trigger an electron to move/jump to another shell or even break free from the atom and its valence shell. When an electron absorbs/gains more energy(photons), then it moves to a more outer shell depending on the amount of energy the electron contains and has gained due to the absorption of 1 or more photons. (Also see: electrons in an excited state)
When an electron releases/loses energy(photons), then it moves to a more inner shell depending on the amount of energy the electron contains and has lost due to the release of 1 or more photons.
1 The number of valence electrons
2 Valence electrons in chemical reactions
3 Valence electrons and electricity
4 External links
Helium atom model
This helium (He) model displays two valence electrons
located in its outermost energy level.
Helium is a member of the noble gases and contains
two protons, neutrons, and electrons.
The number of valence electrons of an element is determined by its periodic table group (vertical column) in which the element is categorized. With the exception of groups 3–12 (transition metals), the number within the unit's place identifies how many valence electrons are contained within the elements listed under that particular column.
Periodic table group Valence electrons
Group 1 (I) (alkali metals) 1
Group 2 (II) (alkaline earth metals) 2
Groups 3-12 (transition metals) 1 or 2*
Group 13 (III) (boron group) 3
Group 14 (IV) (carbon group) 4
Group 15 (V) (nitrogen group) 5
Group 16 (VI) (chalcogens) 6
Group 17 (VII) (halogens) 7
Group 18 (VIII or 0) (noble gases) 8**
* The count of valence electrons is generally not useful for transition metals.
** Except for helium, which has only two valence electrons.
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