WHAT ELEMENT IS THIS: I am a noble gas. I share my name with the home planet of an alien superhero. You will find in a period greater than 3 but less than 6.

I have a feeler it's kryptonite/krypton but let me double check

Explanation:

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

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