A substance has a mass of 171 g and a volume of 15 cm3. What is the substance?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

What was bohr’s contribution to the planetary model