Open QuestionMercury is in the 80th position in the periodic table. how many protons does it have?501views
Open QuestionWhich subatomic particles contribute to an atom's mass number but not its atomic number?460views
Open QuestionWhat is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?1175views
Open QuestionWhich one of the following statements about atoms and subatomic particles is correct?633views