Valence electrons is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed. In a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
The presence of valence electrons can determine the elements chemical properties, such as its valence—whether it may bond with other elements and, if so, how readily and with how many. In this way, a given element's reactivity is highly dependent upon its electronic configuration. For a main group element, a valence electron can exist only in the outermost electron shell; in a transition metal, a valence electron can also be in an inner shell.
An atom with a closed shell of valence electrons (corresponding to an electron configuration s2p6 for main group elements) tends to be chemically inert. Atoms with one or two valence electrons more than a closed shell are highly reactive due to the relatively low energy to remove the extra valence electrons to form a positive ion. An atom with one or two electrons less than a closed shell is reactive due to its tendency either to gain the missing valence electrons and form a negative ion, or else to share valence electrons and form a covalent bond.
Similar to a core electron, a valence electron has the ability to absorb or release energy in the form of a photon. An energy gain can trigger the electron to move (jump) to an outer shell; this is known as atomic excitation. Or the electron can even break free from its associated atom's shell; this is ionization to form a positive ion. When an electron loses energy (thereby causing a photon to be emitted), then it can move to an inner shell which is not fully occupied.
When forming ions, elements typically gain or lose the minimum number of electrons necessary to achieve a full octet. For example, fluorine has seven valence electrons, so it is most likely to gain one electron to form an ion with a 1- charge.
<span>(2) butynu........................</span>
Answer:
Hi there!
The correct answer is 2.29 x 
molecules
Explanation:
To convert from the moles to molecules:
1 mole = 6.022 x 10²³ molecules
so basically you multiply 3.8 by 6.022 x 10²³
and you get: 2.29 x
Answer:
is a weak acid with a strong conjugate base 
is a weak base with a strong conjugate acid 
Explanation:
Weak acids do not completely dissociate in water to its distinctive ions, but instead forms conjugate bases; and ice versa with weak bases. The conjugate base has strong affinity for protons and vice versa.
I hope you found this explanation clear and easy to follow.
A high jump is 6 feet and 10 1/4 inches.
1 meter = 3.28084 feet
1 meter = 39.3701 inches
6 feet x <u> 1 meter </u> = <u>6 meter </u> = 1.82879 meters
3.28084 ft 3.28084
10 1/4 inches ⇒ ((10*4)+1)/4 = 41/4 inches
<u>41 inches</u> x <u> 1 meter</u><u> </u> = <u> 4</u><u>1 meter </u> = <u> </u><u>41 meter </u> = 0.2603 meters
4 39.3701 inches 4 * 39.3701 157.4804
1.82879 meters * this was the equivalent of 6 feet
<u> + 0.26030</u> meters * equivalent of 10 1/4 inches
2.08909 meters
rounded to 2.09 meters.
