What are the horizontal parts of the periodic table called

Jeffe is explaining dimensional analysis to a friend. He says that dimensional analysis can be used to convert between units. What is needed for this conversion?

Which of the following is a physical property? A. Flammability B. Heat of combustion C. Solubility D. Toxicity

Which region of the periodic table of the elements does hydrogen (H) belong to? a. Metals B. Metalloids C. Nonmetals D. Noble gases

How many protons does neon 12 have

Which of the following is necessary to do a complete stoichiometric calculation? A) Add the nuclear masses of the products. B) Divide the nuclear masses of the reactants. C) Write the complete balanced chemical equation.

Find the total number of atoms in a sample of cocaine hydrochloride, c17h22clno4, of mass 22.5 mg.

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction

What is the valence of Fluorine

When liquid helium is exposed to room temperature, it forms a gas. Which best explains why this happens? The liquid helium absorbs energy from the air in the room. The particles in the air absorb the energy of the liquid helium.

Why was Bohr's model considered more accurate than Dalton's model?