The chemical formula for the compound that consists of barium ions (Ba+2) and
oxide ions (0-2) is
Ba₂O₂
O O² Ba²
COBa
Bao

BaO

Explanation:

By reacting the barium ion +2 and the oxygen ion -2, the barium ion neutralizes the oxygen ion, and those two combine form barium oxide, BaO, according to the following balanced chemical formula:

2 Ba + O2 ⇒ 2 BaO

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.