Anitha wrote the formula for oxygen molecule as 2O. Is it correct or not? Why?

In a class, a teacher asked students to write the molecular formula of oxygen. Shamita wrote the formula as O_2 , and Priyanka as O. Which one is correct? State the reason.

In a class, a teacher asked students to write the molecular formula of oxygen Shamita wrote the formula as O2 and Priyanka as O. which one is correct? State the reason. (AS-1)

In a class, a teacher asked students to write the molecular formula of oxygen Shamita wrote the formula as O2 and Priyanka as O. which one is correct? State the reason. (AS-1)

Draw the M.O diagram for oxygen molecule calculate its bond order and show that O_(2) is paramagnetic.

Ravi wrote the symbols for sodium as “S” and symbol for potassium as “P”.Is it correct or not ?why?