Which of the following are properties of compounds formed by covalent bonding (Select all that apply)

1. When you dissolve an covalent compound in water, the solution does not conduct electricity.


2. Covalent compounds often have lower melting points than ionic compounds.


3. When you dissolve an covalent compound in water, the solution conducts electricity.


4. Covalent compounds form when combining two or more nonmetal atoms.


5. Covalent compounds form when combining a two metal atoms.


6. Covalent compounds form when combining a metal atom with a nonmetal atom.