The electronic configurations of three ele¬ments X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?
A. X is a metal
B. Y is a metal
C. Z is a non-metal
D. Y is a non-metal and Z is a metal
Answer:C
The electronic configurations of three ele¬ments X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?
A. X is a metal B. Y is a metal C. Z is a non-metal D. Y is a non-metal and Z is a metal