Question

I need help please help me and I help you
I need help with number 4 only

Answer 1

Answer:

80

   Hg

mercury

   201

--------------

17

  Cl

chlorine

  35

---------------

19

  k

Potassium

 39

----------------

you write it like that put the number on top to the left than under the letters put the name than under name put the other number