The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in__________
A. 4th group
B. 2nd group
C. 14th group
D. 18th group
Answer:C
The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in__________
A. 4th group B. 2nd group C. 14th group D. 18th group