An element with six electrons in its atom at the second energy level?

A lot of valuable information can be gleaned from the position of a chemical element on the periodic table. Remember:

– the serial number is equal to the nuclear charge and the number of electrons;

– the number of the period is equal to the number of energy levels;

– the group number shows the number of electrons in the last level.

So, an element in whose atom:

– 6 electrons at the last level, which means group 6;

– the last level is the second, which means it is in the 2nd period.

We look at the table – this is element number 8, that is, oxygen (O).