Answer: L element has greater atomic number.
Explanation:
The periodic table contains vertical columns called as groups and horizontal rows called as periods.
Period 3 contains 8 elements which are sodium, magnesium , aluminium , silicon , phosphorous , sulphur, chlorine and argon.
K element which belongs to group 13 is aluminium with atomic number of 13 . L element which belongs to group 15 is phosphorous with atomic number of 15.
Thus L element has greater atomic number.
