Check the correct statements regarding a compound and a molecule: A compound consists of two or more distinct bonded atoms
a molecule may consist of two similar elements chemically bonded
a compound consists of any two or more atoms chemically bonded
a molecule is the smallest chemical subunit of a compound

c. 75.7

i think that is the right

6.4 cm (max) - 25 cm (min)

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

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.