The state's landlord-tenant laws protect people living in dwellings owned or leased by others. A person need not be listed on a formal lease to gain protection under these laws, but may gain protection by establishing residence in a place.
The mole is useful in chemistry because it is defined such that the mass of Avogadro's number of particles (atoms or molecules) of a substance (the molar mass) is equal to the sum of the numerical values of the atomic masses of its constituent elements.
Why is the periodic table such a useful tool for chemists? Atoms in the same group on the periodic table tend to have similar physical and chemical properties. This is because they have the same number of electrons in their outer energy levels. Scientists can use this information to predict how atoms will react with each other.