What element has only one proton in its nucleus?

Using the periodic table, how would you find elements with chemical properties similar to helium?

Which two large world regions that have relatively small proven crude oil reserves.

Suppose you determined the density of a cube to be 1.40 g/cm3. would the density of the cube be different if you had a cube made of the same material with twice as much mass? explain.

Waves that require a medium through which to pass are called electromagnetic waves true or false

1. Are state changes chemical or physical changes? Provide an example of a state change and explain why it is a chemical or physical change.

A certain shade of blue has a frequency of 7.26 * 1014 Hz. What is the energy of exactly one photon of this light?

A 20.0 mL sample of a NaCl solution has a mass of 21.040 g. After the solution is evaporated to dryness, the dry salt residue has a mass of 4.348 g. Calculate the following concentrations for the NaCl solution.

What are the intermolecular forces present in Argon?

What characteristic is shared by most simple polyatomic ions? A) They are anions. B) They are bonded ionically. C) They are cations. D) They have positive charges.

Potassium ions (k+) have a positive charge. What happens to a potassium atom electrons when it becomes an ion