Examine the equation.

2H2(g) + O2(g) → H2O(l)

Match the equation's components to the appropriate description.

H2O -- product
O2 -- reactant
(g) -- state of matter
→ -- yields

2H2(g) + 2O2(g) → H2O(l)

Explanation:

First balance the know equation.

Then:

2 -Coeffient

O2 and H2 reactants

H2O -product  

→ yields

indium, and thallium have three electrons i think

thats how its supposed to be