Essay The Periodic Guide: Study Guide
Explain how scientific observations led to the development of, and changes to, the periodic table.
-Dmitri Mendeleev- first periodic table, organized 63 known elements according to properties, organized into rows and columns and wrote name, mass, and chemical properties on each
-Julius Lothar Meyer- independently worked in Germany, similar to Mendeleev
-Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the …show more content…
Dipole-dipole forces are electrostatic interactions of permanent dipoles in polar molecules. The attractive forces that occur between the positive end of one polar molecule and the negative end of another polar molecule tend to align the molecules to increase the attraction.
Hydrogen bonding is a particularly strong dipole-dipole interaction in which hydrogen is covalently bonded to a highly electronegative element, and attracted to the very electronegative element in another molecule. It occurs only in molecules containing N-H, O-H or F-H bonds.
Ion-dipole forces are attractive forces that result from the electrostatic attraction between an ionic compound and a polar molecule. This interaction is most commonly found in solutions, especially in solutions of ionic compounds in polar solvents, such as water.
Identify the intermolecular forces experienced by different compounds.
Intramolecular Forces: The forces of attraction that occur between individual molecules.
Lesson 03.08: Naming Compounds
Correctly name covalent compounds, ionic compounds, and acids when given their formulas.
A metal forms a positive ion (cation) and a nonmetal forms a negative ion (anion). The cation and anion combine to form an ionic compound, more specifically referred to as a binary ionic compound.
Compounds between nonmetals are almost always molecular instead of ionic