Calcium has 20 electrons. how many electrons are in the outer shell?
a. 0
b. 2
c. 6
d. 8

2

Explanation:

For the first 20 elements, the first energy level can hold a maximum of two electrons, the second energy level can hold a maximum of 8 and the third energy level can hold a maximum of 8. Calcium has 20 electrons, so we put two in the first energy level, 8 in the second, 8 in the third and we are left with two for the fourth energy level.

Ca: 2,8,8,2

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

what is the question here. i think you messed up.