If the atomic number is 3 and the mass number is 7 what is the number of protons

A mixture of 90.0 grams of CH4 and 10.0 grams of argon has a pressure of 250 torr under conditions of constant temperature and volume. The partial pressure of CH4 in tore is?

At what temperature does the solid start melting? - 20°C 0°C 20°C 80°C

Which substance is the oxidizing agent in this reaction? fe2o3+3co→2fe+3co2 express your answer as a chemical formula?

In what ways could this mountain range change over a very long period of time? Explain your reasoning

How does an elements period number related to the number of the energy level of its valence electrons?

Which particles in the atom are referred to as nucleons?

discuss the origin of the line citing the bohr theory of the atom specify any energy transitions that are applicable

What does the chemical formula of an ionic compound represent?

The wavelength of some yellow light is 580.0 nm. What is the frequency of this yellow light?

A sample of chlorine gas contracts from 550 mL to 376 mL when it is cooled from 63 °C to 12 °C. If the initial pressure of the chlorine was 725 torr, what is the final pressure of the chlorine?