Is it true that Oxygen is placed in the second period and group 4 in the periodic table?

The given statement is false.

A period is determined by the number of shells and the group is determined by the number of electrons present in the outermost shell. Oxygen has atomic number 8 and its electronic configuration is 2,6. It has two orbits and hence 6 electrons in the outermost shell, hence it is placed in the second period and group 6 in the periodic table.

The correct statement would be -  Oxygen is placed in the second period and group 6 in the periodic table