Lithium (Li) and oxygen (O) are both in period 2. They both have . the same number of protons
two electron shells
the same number of electrons
similar properties

So Lithium (Li) and Oxygen (O) are both have two electron shells

Explanation:

Lithium (Li) and oxygen (O) both have two electron shells.

Explanation:

Answered correct on my test.

Also I'm aware you asked this around 4 months ago although I still wanted to answer so those who may need an answer in the future can reflect on this response and get the correct answer they deserve. Thanks! Happy New Year everyone. <3

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.