. An element has the electronic structure 2,8, 4. Which group is it in? A group 3
B group 4
C group 0​

Ans A

Explanation:

no. of shells determine the group

 None of the options

Explanation: 2, 8, 4 represents a total of 14  electrons.  

The 2:   1s^2

The 8:  2s^2 2p^6

The 4:   3s^2 3p^2

Assuming a neutral atom, 14 electrons represnt element #14, Silicon.  The electron configuration matches that of silicon,  But silicon is in group  14, which is not in the options.  It is a metalloid, so if there is another grouping system, use the nuimber assigned to the metalloids.  But the word "Group"normally refers to the column number, 14 for silicon.  And I've never heard of Group 0.  

for points guys

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.