C. pockets of gas in the solar system D. planets orbiting the stars other than the sun
17. The asteroids are
A miniature planets
B. satellites of planets
18. Meteors are
A falling stars
B. signals from the other worlds
C. solar wind particles captured by the earth's mag
D. luminous trails left by small extraterrestrial part​

a:

by the combination of an unlimited number of elements

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

b) nuclear ive learned that in a pedtrodic table