Question

What is the formula unit for a compound made from Li and Cl? (5 points)

Answer 1

Answer:

LiCl because the total negative charge on Cl is one.

Explanation:

By criss crossing the charge numbers, we find the chemical formula of a compound

For example Aluminium chloride

Al has 3+ charge and Cl has 1- charge  

3 becomes the subscript of Cl and 1 becomes the subscript of Al  

So the chemical formula will be $Al_1 Cl_3$

Few examples are as follows:

Sodium Hydroxide is NaOH as Na the charge is $1^+$ and OH the charge is $1^-$

Sodium phosphate is $Na_3 PO_4$ as sodium has $1^+$ charge and phosphate has $PO_4^3-$ charge.

Sodium sulfate is $Na_2 SO_4$ as sodium has $1^+$ charge and sulfate is $SO_4^2-$ charge.

Sodium chloride will be NaCl as sodium has $1^+$ charge and chloride has $1^-$ charge.

Calcium phosphate will be $Ca_3 (PO_4 )_2$ because Calcium possess $2^+$ charge and phosphate has $PO_4^3-$ charge.

Li has a charge of $1^+$ and Cl has a charge of $1^-$ and hence  the chemical formula we get is $LiCl$

Answer 2

Answer:

LiCl because the total negative charge on Cl is one. (Option 1)

Explanation:

Lithium (Li) is part of group 1. This means it has 1 valence electron. This can be represented as Li+. Lithium has a positive charge of 1.

Chlorine (Cl) is part of group 17. This means it has 7 valence electrons. It needs 1 electron to get the stable noble gas configuration. This can be represented as Cl-. Chlorine has a (negative) charge of -1.

Li+ + Cl- → LiCl

The total charge on LiCl is zero.

This means the first option is correct : LiCl because the total negative charge on Cl is one.