6,000,000,000,000,000,000,000,000-k g Earth weighs_ N?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Explain what happens at the saturation point when adding salt to water at room temperature.

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j