True or false The atomic number of an element is always more than the mass number of that elemenT

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

Which best describes how johannes kepler developed his laws of planetary motion