WebEach atom has a charged sub-structure consisting of a nucleus, which is made of protons and neutrons, surrounded by electrons. The number of protons and the mass number of an atom define the type of atom. Atoms of the same element with different mass numbers are called isotopes. Created by Jay. Webmetastable state, in physics and chemistry, particular excited state of an atom, nucleus, or other system that has a longer lifetime than the ordinary excited states and that generally has a shorter lifetime than the lowest, often stable, energy state, called the ground state. A metastable state may thus be considered a kind of temporary energy trap or a …

Introduction to ions (video) Khan Academy

WebA given atom has an atomic mass approximately equal (within 1%) to its mass number times the atomic mass unit (for example the mass of a nitrogen-14 is roughly 14 Da), but this number will not be exactly an … WebWhen a stable atom gains or loses an electron, it becomes an ion. For example, when chlorine takes an electron from sodium, and sodium gives that electron to chlorine, they … mountable uv light

Bohr Diagrams of Atoms and Ions - Chemistry LibreTexts

Websubatomic particle, also called elementary particle, any of various self-contained units of matter or energy that are the fundamental constituents of all matter. Subatomic particles … WebValence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴. Created by Sal Khan. Sort by: WebDec 7, 2015 · Atom — The smallest particle of an element that can enter into a chemical reaction.. Electron — An elementary particle with a negative electrical charge and a mass 1/1837 that of the proton.Electrons surround the nucleus of an atom because of the attraction between their negative charge and the positive charge of the nucleus. A stable … mountable utensil container for bar