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This guide covers the fundamental concepts of atoms and bonding, highlighting the unique attributes of elements defined by subatomic particles: protons, neutrons, and electrons. It explains how to determine atomic number and mass, and introduces Bohr diagrams for visualizing electron orbits and Lewis dot diagrams for representing outer electrons. The guide distinguishes between ionic bonding, where electrons are transferred, and covalent bonding, where electrons are shared, emphasizing the importance of stability through electrical balance and full electron shells.
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Atoms • The smallest particle unique to given element; it has one or more subatomic particles • Subatomic Particles Charge Mass Location Protons Positive 1 nucleus Neutrons neutral 1 nucleus Electrons negative 0 orbiting
Subatomic Particles • Protons = the Atomic Number • Neutrons = the Atomic Mass (rounded) minus the Atomic Number • Electrons = the same as the number of Protons (unless otherwise told)
Bohr Diagrams • Represent the Nucleus Write the number of protons and neutrons • Represent the Electron Orbits First Orbit = holds up to 2 electrons Second Orbit = holds up to 8 electrons Third Orbit = holds up to 8 electrons Fourth Orbit = at least 8 electrons
Lewis Dot Diagrams • Write the Atomic Symbol • Represent only the Outer Electrons with Dots around the Atomic Symbol
Bonding • Atoms bond in order to become stable 1) Electrically equal number of protons and electrons 2) Structurally full outer orbit of electrons
Ionic Bonding • Type of chemical bond in which atoms transfer electrons (one gains and one loses). During the transfer each atom become an ion (a charged atom).
Covalent Bonding • Type of chemical bond in which atoms share electrons.