Multiple ChoiceIn an atom, which type of electrons are primarily responsible for shielding the nucleus from the valence electrons?51views
Multiple ChoiceWhich of the following correctly describes the number of protons, neutrons, and electrons in a neutral atom of barium-137 (Ba-137)?73views
Multiple ChoiceWhich of the following is a characteristic of the nucleus (the part of the atom marked "a")?63views
Multiple ChoiceOzone is a molecule in the upper atmosphere that is made up of three atoms of _____.60views
Multiple ChoiceWhat is the total number of protons, neutrons, and electrons in a neutral atom of cadmium-112 (Cd-112)?55views
Multiple ChoiceThe form of oxygen that combines three oxygen atoms into each molecule is called _____.44views
Multiple ChoiceAccording to diagrams showing elemental abundances in the Milky Way galaxy, which element is the third most abundant?47views