The lanthanides and Actinides, Which Include All of the F-block Elements, Display Which Properties? - They are more reactive than the alkali metals

- They can form cations with various charges

- They have low atomic mass

- They only form ions with a +4 charge

- They form covalent bonds with halides

- They are less reactive than the group 1A elements

2b2t

explanation:

2b2t

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.