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Choose a likely identity for X, Y, and Z in these structures.

Choose a likely identity for X,Y, and Z in these s

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Concepts and reason

• In chemistry, a Lewis structure represents the number of electrons present around each atom of the molecule as bonding electrons as well as non-bonding electrons.

• It is also called as Lewis-dot structure that represents the chemical symbol of each element along with lone pair and bond pair of electrons in the molecule.

• Lewis structure is used to draw a covalently bonded molecule as well as coordination compounds.

Fundamentals

oA Lewis structure represents the bonding and lone pair of electrons in the molecule.

oValence electrons are the electrons present in the outermost shell of an atom.

oDots are used to represent the electron position around the atoms and lines or dot pairs are used to represent covalent bonds between atoms.

oThe Lewis structure is based on the concept of the octet rule. So, the shared electrons in each atom have 8 electrons in its outer shell.

The total valance electrons present in each element is given below:

The octet electrons for each atom are given below:

Number of octet electrons of beryllium(Be) = 2
Number of octet electrons of boron (B)
Number of octet electrons of carbon (C)

The number of bonding electrons is calculated using the following formula:

(Total valence
Total octet
Bonding electrons
electrons
electrons

The lone pair (non-bonding pair) of electrons is calculated using the following formula:

(Total valence
Total bonding
Lone pair of electrons
electrons
electrons

The structure of the compound is given below:

The suitable element for X is Be

Check the identity of the element by counting the lone pair and bond-pair electrons.

The bonding pair of electrons is calculated below:

The lone pair (non-bonding pair) of electrons is calculated below:

total valence
total bonding
lone pair of electrons
electrons
electrons
=2-2
=0

The structure of the compound is given below:

: CI
Cl
-Y-
CI

The suitable element for is В.

Check the identity of the element by counting the lone pair and bond-pair electrons.

The bonding pair of electrons is calculated below:

The lone pair (non-bonding pair) of electrons is calculated below:

The structure of the compound is given below:

The suitable element for is

Check the identity of the element by counting the lone pair and bond-pair electrons.

The bonding pair of electrons is calculated below:

The lone pair (non-bonding pair) of electrons is calculated below:

Ans:

The identity for X in this structure is given below:

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