1bonding and 3non-bonding
(Refer to the attachment for structure
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Explanation:
the physical and chemical properties of an element are periodic functions of their atomic number.
Answer : The formula unit of Sr & Cl is
and the formula unit of Al & S is 
Explanation :
Formula unit : it is defined as the lowest number ratio of ions of an elements in an ionic compound or covalent compound.
For the formula unit of Sr & Cl, two chloride ions
are needed to neutralize the one strontium ion
.
For the formula unit of Al & S, three sulfide ions
are needed to neutralize the two aluminium ion
.
The formula unit of
and
are shown below.
Iron is left in the filter and salt solution (salt and water) passes into the cup.
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