A student is asked to balance an equation by using the half-reaction method. He determines the two half reactions as
shown below
2Br" >Br2 +2e"
Cl2 +2e- 201
What should he write as the final, balanced equation?
Cl2 + 2B- B2+2C1
Cl2 + 2Br +2 —>Br2+2cm
Cl2+28°——»Br2+201"+ 2e
Cly+Br"+2" —>Bry+C1"+ 20

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.