Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test Chemistry General Principles And Process of Isolation of Elements Metals and Its Ores
The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?
1
Y is a non-metal and Z is a metal
2
Y is a metal
3
Z is a non-metal
4
More than one of the above
5
None of the above