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periodic table

Post-reading tasks 1. Match the words or phrases (1-7) with the definitions (A-G)

Atomic Number: the number of protons in the nucleus (which is the same as the number of electrons in the atom).

Name: the element's common name.

The periodic table organizes elements by their atomic numbers. It also organizes them into groups with similar properties. These groups are organized into columns. Some larger regions of the table feature general similarities. For instance, the right side of the table features non-metals. The center and left side of the table presents metallic elements. The two are separated by metalloids, which only resemble metals.

The leftmost column of the table consists of alkali metals. These metals are soft, silver, and shiny. The next column to the right features alkali-earth metals. The next ten columns are the transition metals. The transition metals include the lanthanides and the radioactive actinides. To the right of transition metals are the post-transition metals. Halogens, such as oxygen, are located to the right of them. The next column has halogens. The table\s final column holds the inert gases. These are also called the noble gases because they don’t usually react with other elements.

Post-reading tasks
1. Match the words or phrases (1-7) with the definitions (A-G)
1__ group
2__ period
3__ valence shell
4__ element symbol
5__ VSEPR theory (Valence shell electron pair repulsion theory)
6__ valence electron
7__ ionization energy
8__halogen
9__actinide
10__lanthanaide
11__chalcogen
12__noble gas
13__alkali metal
14__alkali-earth metal
15__post-transition metal

A. the energy to remove an electron from an atom.

B. one of the periodic table’s columns, with atoms that share traits.
C. the outermost electron shell of an atom.
D. one of the periodic table’s rows, organized by atomic numbers.
E. an electron on an atom’s outermost shell.
F. one or two letters that represent an element.
G. a model predicting the molecules’ shape.
H. an element in the periodic table’s first group.
I. an element in the periodic table’s seventeenth group.
J. an element also referred to as rare earth element.
K. a radioactive element with atomic numbers between 89 and 103.
L. an element to the right of the periodic table’s transition metals.
M. an element in the periodic table’s sixteenth group.
N. a nonreactive element in the periodic table’s rightmost group.
O. an element in the periodic table’s second group.

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