Question

what are Valence electrons?
write the periodic table group Valence and what are the basic rules of Lewis symbols??

spam= 20 answers reported​

Answer 1

QUESTION⤵️

what are Valence electrons?

write the periodic table group Valence and what are the basic rules of Lewis symbols??

ANSWER⤵️

VALENCE ELECTRON:::-

a valence electron is an outer shell electron that is associated with an atom and that can participate in the formation of a chemical bond

the valence (or valency) of any element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.

PERIODIC TABLE GROUP VALENCE:::-

$\longrightarrow group 1 (I) (alkali metals)$

$\longrightarrow group 2 (II) (alkaline earth metals)$

$\longrightarrow group 3 - 12 (transition metals)$

( cannot hold any more electrons)

$\longrightarrow group 13(III) (Boron group)$

$\longrightarrow group 14(IV) ( Carbon group)$

$\longrightarrow group 15( V) ( pnictogens)$

$\longrightarrow group 16(VI) (Chalcogens)$

$\longrightarrow group 17( VII) ( Halogens)$

$\longrightarrow group 18( VIII or 0) ( Noble gases)$

✝ the general method for counting valence electron is generally not useful for transition metals.

Instead the modified electron count method is used.

✝ except for helium which has only two valence electrons.

LEWIS SYMBOLS:::-

✝ G. N. LEWIS, AN AMERICAN CHEMIST INTRODUCED SIMPLE NOTATIONS TO REPRESENT VALENCE ELECTRONS IN AN ATOM THESE NOTATIONS ARE CALLED LEWIS SYMBOLS.

BASIC RULES:::-

⛥draw the atomic symbol.

⛥treat each side as a box that can hold up to the two electrons count the electron in the valence shell.

⛥start feeling box don't make tears unless you need to.

SIGNIFICANCE OF LEWIS SYMBOL:::-

✘the number of dots around the symbol represents the number of valence electron.

✘this number of Valence electrons helps to calculate the common or group valency of the element.

✘the group valence of the element is generally either equal to the number of dots in Lewis symbol or 8 minus the number of dots or valence electron.

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Answer 2

Valence electron -:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

""Examples include hydrogen (H), lithium (Li), and sodium (Na). Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr). Oxygen, like all the other elements in group 16, has six valence electrons.""

The lewis dot structure ignores the nucleus and all non-valence electrons, displaying only the valence electrons of an atom.

Of valence electrons by reading the group number for each element.

The kernel of the atom, i.e., the nucleus together with the inner electrons, is represented by the chemical symbol, and only the valence electrons are drawn as dots surrounding the chemical symbol.

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