During reaction between calcium and oxygen valence electrons A. are transferred from atoms of calcium to atoms of oxygen to form Ca+ and O- ions

B. are shared between atoms of calcium and atoms of oxygen

C are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ions

D. are transferred from atoms of oxygen to atoms of calcium to form Ca- and O+ ions

C are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ion

Explanation:

Calcium is a meta and Oxygen is a non metal. The bond that forms between a metal and a non metal is an ionic bond. In an ionic bond, the metal loses electrons while the non metal gains the electrons; hence there is transfer of electrons.

Calcium belongs to group 2 and oxygen needs 2 more electrons to complete it's electronic configuration.

Calcium would lose two electrons to form Ca+2 and oxygen would gain two electrons to form O-2 ion

The correct option is;

C. are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ion

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3