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Since density is mass/volume, the density is 5g/ml.
Answer:
d. ns2np3
Explanation:
In the first main group all elements have a singly occupied s orbital.
In the second main group, all elements have a doubly occupied s orbital.
In the third main group or 13th group all elements have a doubly occupied s orbital and a singly occupied p orbital.
In the fourth main group or 14th group all elements have a doubly occupied s orbital and a doubly occupied p orbital.
In the fifth main group or 15th group all elements have a doubly occupied s orbital and a triply occupied p orbital.
And so on.
Answer:
CoSO4.7H2O
Cobalt II tetraoxosulphate VI heptahydrate
Explanation:
According to IUPAC nomenclature, compounds are named systematically.
We were told that there are seven water molecules in each formula unit Hence the correct formula of the compound is CoSO4.7H2O
According to IUPAC system, the metal is first named, followed by its oxidation state in Roman numerals. Then the name of the anion is mentioned as well as the number of water molecules. We have to take into account the correct prefix signifying the number of molecules of water of crystallization.
