Explain, in terms of atomic structure, why group 18 elements on the periodic table rarely form compounds

Novelty devices for predicting rain contain colbalt chloride and are based on the following equilibrium: CoCl2 (s) + 6H2O (g) = CoCl2.

Give two possible sets of four quantum numbers for the electron in hydrogen when it is in its lowest energy state.

A hardware salesman measures the mass of a box containing 1000 washers. The mass is 0.4168 kg . What is the mass of a single washer in milligrams? Write your answer as a decimal.

A solution that contains the maximum amount of dissolved solute in a fixed quantity of solvent at a particular temperture is called a (n) solution.

The mass of a single gold atom is 3.27*10-22 grams. How many gold atoms would there be in 70.6 milligrams of gold?

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide