Consider the following electron configuration by shell of an unknown element: 2 8 18 18 7. 
(i) This element belongs to which group and period in the periodic table?
(ii) Determine whether the element is a metal or a nonmetal.
(iii) Determine the number of protons in an atom of this element.
(iv) Provide the identity of the element.
(v) Draw the electron-dot symbol of this element.

• A. (i) Group 7A; Period 5; (ii) nonmetal; (iii) 53 protons; (iv) iodine; (v) electron-dot symbol:
• B. (i) Group 7A; Period 4; (ii) nonmetal; (iii) 35 protons; (iv) bromine; (v) electron-dot symbol:
• C. (i) Group 6A; Period 5; (ii) nonmetal; (iii) 52 protons; (iv) tellurium; (v) electron-dot symbol:
• D. (i) Group 6A; Period 4; (ii) nonmetal; (iii) 34 protons; (iv) selenium; (v) electron-dot symbol:

Answer: (A)