. Both element K and element L are found in period 3 of the periodic table. If K is in group 13 while L is in group 15, which of the two
has a greater atomic number? Explain.

 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.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i