Important People In CHM Simplified

This set covers important people in chemistry based off of lecture materials in CHM 125 at GVSU. This material is designed to match quest 2 in this course. Several people are covered in this set.

Millikan

Determined the charge and the mass of an electron

Democrtius

Proposed that all matter was composed of small, finite particles called atoms

Proust

Devised the law of proportions, also called the law of constant composition

J.J Thompson

Used cathode ray tube to find evidence for electrons

Nagaoka

Proposed an atomic model consisting of a positively charged sphere surrounded by a ring of electrons

Bohr

Developed an atomic model where a moving electron in an orbit does not emit radiation but emits or absorbs a photon when moved to a new orbit

Albert Einstein

proposed that quantized light striking the metal surface is not a wave but is a stream of particles (photons) whose energy depends on their frequency

De Broglie

Models an electron as a circular standing wave where only an integer number of wavelengths could fit exactly within the orbit

Rydberg

Developed an empirical formula that predicts all of hydrogen’s emission lines

Heisenberg

Deduced that there is a fundamental limit to how accurately we can simultaneously measure a particle’s position and its momentum.

Dalton

Helped to revolutionize chemistry with his hypothesis that the behavior of matter could be explained using atomic theory.

What does the atomic theory explain, and who came up with it?

Dalton - atomic theory provides a microscopic explanation of the many macroscopic properties of matter in chemistry

Rutherford

He performed a series of experiments using a beam of high-speed, positively charged alpha particles that were produced by the radioactive decay of radium; α particles consist of two protons and two neutrons. This was known as the gold foil experiment.

Rutherford proposed what kind of model?

an atom consists of a very small, positively charged nucleus, in which most of the mass of the atom is concentrated, surrounded by the negatively charged electrons, so that the atom is electrically neutral

In Rutherfords _______experiment he discovered…

Goldfoil, the proton

Planck

Models a blackbody however; this model restricts how atoms vibrate this because frequences are not continuous only certain frequencies are allowed.

Schrodinger

describes electrons as three-dimensional stationary waves, or wave-functions, represented by the Greek letter psi, ψ.

Rutherford’s model was referred to/known as the _______ model.

Plantary

Bohrs model only allowed for how many electrons?

one

schrodinger

applied his equation to hydrogen-like atoms, he could reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.

Maxwell

Developed the theory of electromagnetic radiation and showed that light was the visible part of a vast spectrum of electromagnetic waves; the particle view of light became thoroughly discredited.