What is the first element of the periodic table?

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Answer explain why it is not possible to deduce a complete order of reactivity.

The diagrams to the right show the distribution and arrangement of gas particles in two different containers. according to kinetic-molecular theory, which of the following statements is true? check all that apply. if the temperatures of both containers are equal, container a has greater pressure than container b. if the volume of container a decreased, its pressure would decrease. if the pressure in both containers is equal, container a has a lower temperature than container b.