Question

19 multiple choice 5 points how many valence electrons does group 18 have? 8 2 4 6

Explanation:

Group 18 elements are noble gases. Helium (the first element in group 18) has 2 valence electrons. But for other elements in group 18 (Ne, Ar, Kr, Xe, Rn), they have 8 valence electrons. However, in the context of general valence - electron count for the group (excluding the special case of He in some basic discussions where the focus is on the common trend), the answer is 8.

Answer:

8