Interatomic theory

How atoms join up and how the table is organized: elements that pair with themselves, molecules that share a formula but not a shape, charged groups that travel as one piece, the families of the periodic table, and the stories behind the names.

Atomic theory questionsThe Chapter 2 in-class questions: Dalton's atomic theory, the laws of definite and multiple proportions, mass spectrometry, and who discovered what. Each part checks as you go.practice/atomics/atomic-theory
Law of multiple proportionsReal compounds that follow the law, with the ratios worked out. Then practice problems from lab data, checked one step at a time, and rounds of ten questions.practice/atomics/multiple-proportions
ElementsAn article on every element from hydrogen to oganesson: where it sits, what it looks like, who found it and what it is used for.practice/atomics/elements
DiatomicsThe seven elements found in nature as pairs. Study the list and the 7 on the periodic table, quiz yourself, and read a page on each element and each molecule.practice/atomics/diatomics
IsomersSame formula, different structure, different substance. Drawn isomers with their properties, cis and trans, chiral and not, and two drills.practice/atomics/isomers
Polyatomic ionsThe names, formulas and charges. A study list you can cover up, the naming patterns, and rounds of ten questions.practice/atomics/polyatomic-ions
Element familiesAlkali metals, halogens, noble gases and the rest: a colored table, what each family does, and a quiz by name, by position and by membership.practice/atomics/families
Element triviaWhere the names came from, who found what, and why sodium is Na. Read the stories, then quiz yourself on them.practice/atomics/trivia