Is milk a mixture, compound, or element

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

What are transitions between a liquid and a solid called? identify which way they are transitioning

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.