This is true, think of silver, gold, etc— those are heated to make them liquid
        
             
        
        
        
Answer:
3.6 × 10²⁴ molecules
Explanation:
Step 1: Given data
Moles of methane (n): 6.0 moles
Step 2: Calculate the number of molecules of methane in 6.0 moles of methane
In order to convert moles to molecules, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ molecules of methane in 1 mole of molecules of methane.
6.0 mol × 6.02 × 10²³ molecules/1 mol = 3.6 × 10²⁴ molecules
 
        
             
        
        
        
Isotopes of  the same element
₃₅⁷⁷X and ₃₅⁸¹X
<h3>Further explanation</h3>
Given
Isotopes of element
Required
Isotopes of  the same element
Solution
The elements in nature have several types of isotopes  
Isotopes are elements that have the same Atomic Number (Proton)  and different mass numbers
Element symbols that meet the 2 conditions above are :
₃₅⁷⁷X and ₃₅⁸¹X
 
        
             
        
        
        
Their locations can vary depending on the molecule they are associated with but they are usually in a "cloud " that is on the outside of an atom/molecule and if the atom is unstable the  electrons tend to be located farther away from the atom. 
        
             
        
        
        
The answer is Solid.
This is on account of the substances that develop a solid are packed in a settled, firmly pressed geometric plan.