Multiple ChoiceWhich of the following best describes the difference between an atom and a molecule?38views
Multiple ChoiceWhich of the following best describes the difference between a molecule and an atom?28views
Multiple ChoiceWhich of the following is the number of electrons in a neutral atom of scandium (Sc)?34views
Multiple ChoiceWhat is the atomic number of an ion with a +1 charge that contains 18 electrons?38views
Multiple ChoiceWhich element has an atom with the electron configuration 2-5, and how many protons does it contain?38views
Multiple ChoiceAn atom has a mass number of 27 and 14 neutrons. What is the atomic number of this atom?35views
Multiple ChoiceWhich of the following chemical formulas represents the main ingredient in natural gas?35views