Chemistry 101: Arsenic in your Food
Lecture on January 24 , 2013
Chemists switch between the molecular view and the bulk view without a second
A colorless liquid with an odor
Not a flat molecule
Note that chemists use the name of the element to mean relevant compounds
containing the element.
Some of the arsenic in food and drink is carcinogenic in humans. Fish contain the
highest concentration of arsenic, but the compounds are not toxic. Rice contains
the highest concentration of the toxic compounds.
Atom: smallest stable structure having properties of the element. Consists of
electrons, protons and neutrons.
Element one of the 110 constituents of stable matter above the atomic scale.
Molecule: a stable grouping of atoms each of which is connected to a small
number (1-6) of other atoms.
Ion: an atom of molecules that has gained or lost an electron.
Electron: one of the three fundamental particles of chemistry.
Atoms consist of protons, electrons and neutrons. Dense compact nucleus,
diffuse electron cloud. Number of protons and number of electrons are
The number of protons is the atomic number
Elements are written in order of increasing electronegativity, the ability of an
atom to attract electrons. Similar to electron affinity.
Periodic properties vary in a systematic way when the elements are arranged in
the periodic table.
Isotope: form of an atom defined by the neuron number. Most of the elements
have more than one stable i