Question

Which of these are elements?
Au, C, K, O
H₂O, CO₂, NaCl
Milk, Mud, Air

Answer 1

Au, C, K, O

Step-by-step explanation:

Au = Gold

C = Carbon

K = Potassium

O = Oxegen

H20 = Not an element on the periodic table

CO2 = Not an element on the periodic table

NaCl = Not an element on the periodic table

Milk = Not an element on the periodic table

Mud = Not an element on the periodic table

Air = Not an element on the periodic table

Hope this helps! :)