Answer : The element is belongs to the group 17 having the seven valence electrons and they will usually form one chemical bonds to another element.
Explanation :
As per given in the question that the element has seven valence electrons that means the seven electrons are present in their outermost energy level or shell.
Form the given information we conclude that, the group number is, 17 (because there are 7 valence electrons in outermost shell).
The elements belongs to group 17 are fluorine, chlorine, bromine and iodine and they are the halogens.
The general electronic configuration of halogens are, that means they have seven valence electrons in their outermost shell and they need only one electrons to complete their octet. So, they will usually form one chemical bonds by accepting one electrons from the other elements.
Hence, the element is belongs to the group 17 having the seven valence electrons and they will usually form one chemical bonds to another element.
The mass of sodium sulfite that was used will be 1,890 grams.
<h3>Stoichiometric problems</h3>First, the equation of the reaction:
The mole ratio of SO2 produced and sodium sulfite that reacted is 1:1.
Mole of 960 grams SO2 = 960/64 = 15 moles
Equivalent mole of sodium sulfite that reacted = 15 moles
Mass of 15 moles sodium sulfite = 15 x 126 = 1,890 grams
More on stoichiometric problems can be found here: brainly.com/question/14465605
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