The
Period Table is an Instructional material constructed to aid effective teaching
of Chemistry in Senior Secondary School classes. Instructional materials are used
to improve students’ knowledge, abilities, and skills, to monitor their
assimilation of information, and to contribute to their overall development and
upbringing.
There
are three basic types of instructional materials: concrete objects, including
objects from the world of nature; representations of concrete objects and
phenomena; and descriptions of such objects and phenomena by means of the
signs, words, and sentences of natural and artificial languages.
The periodic table is the most important classification of
element in the chemistry. It was first arranged by Dmitri Mendeleev in 1869.
The periodic laws were that the properties of an element are
a periodic function of the atomic numbers. In the periodic table, element with
the same number of valence electron are arranged in groups while elements with
the same number of electron shells are arranged in periods.
Element in the same group show very similar properties since
their atom has the same number of electrons. These elements are arranged as
members of a family.
The elements in the periodic table may be divided into
blocks according to the orbital electron that are responsible for the position
of the electrons. The s block has s electron in the out most energy level, while
the p block has both s and p electron. The transition elements contain d
electron with s an electrons while the lanthanides and actinides contain f
electron in addition to the s, p and d electrons.
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