Essay

Topics: Chemical element, Atom, Atomic number Pages: 4 (504 words) Published: April 1, 2013
Atoms and the Periodic Table

Chapter 2

Atoms and the Periodic Table / Elements and the Periodic Table * An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction.

* Each element is identified by a one- or two-letter symbol.

* Elements are arranged in the periodic table.

* The position of an element in the periodic table tells us much about its chemical properties.

Atoms and the Periodic Table / Elements and the Periodic Table

Atoms and the Periodic Table

Atoms and the Periodic Table / Metals, Nonmetals, and Metalloids * The elements in the periodic table are divided into
three groups—metals, nonmetals, and metalloids.

Metals:

* are located on the left side of the periodic table

* usually exist as shiny solids
* are good conductors of heat and electricity
* are solids at room temperature, except for mercury (Hg), which is a liquid

Atoms and the Periodic Table / Metals, Nonmetals, and Metalloids Nonmetals:

* are located on the right side of the periodic table

* usually do not have a shiny appearance

* are usually poor conductors of heat and electricity

* can be solids, liquids, or gases at room temperature

solid liquid gas sulfur bromine nitrogen carbon oxygen
Nonmetals, and Metalloids
Metalloids:

* are located on the solid line that starts at boron
(B) and angles down towards astatine (At)

* have properties intermediate between metals
and nonmetals

* are represented by only seven elements:

boron (B) antimony (Sb) silicon (Si) tellurium (Te) germanium (Ge) astatine (At)
arsenic (As)...
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