Explanation:
Elements that belong to the same period which is seen horizontally in the periodic table have different properties. Elements with similar properties are seen in columns or groups. Elements in the same period have similar principal quantum number and belong to the same principal shell. Hence the answer is that they have different properties that repeat across the next period.
Compounds that primarily contain carbon are known as organic compounds.
Answer:
A dipole-dipole force is when the positive side of a polar molecule attracts the negative side of another polar molecule.
A hydrogen bond is a dipole-dipole force and is an attraction between a slightly positive hydrogen on one molecule and a slightly negative atom on another molecule.