Proton, A positively charged subatomic particle located in the atom's nucleus. It determines the element's identity., Neutron, A neutral no charge subatomic particle located in the nucleus. It adds mass and helps stabilize the atom., Electron, A negatively charged subatomic particle that orbits the nucleus. It is responsible for chemical bonding., Atomic #, The number of protons in an atom. This number uniquely identifies each element on the periodic table.Atomic mass: The total aver, Atomic mass, The total average mass of an atom, roughly calculated by adding together its protons and neutrons., Flame test, An analytical procedure used to detect the presence of certain elements based on the characteristic color of light they emit when heated in a flame., Shell, The specific energy levels or orbits where electrons reside, surrounding the atomic nucleus., Valence electron, The electrons located in the outermost shell of an atom. These are the electrons that participate in chemical reactions., Ground state, he lowest and most stable energy state of an atom where all electrons are in their lowest available energy levels., Excited state, : A temporary state where an atom has absorbed energy, causing one or more electrons to jump to a higher energy level than their ground state.

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