Chemistry Period Table and nomenclature

1. Modern Periodic Table and
Nomenclature of Elements
By Venkat Sai Karanam
Mithun Krishna Prasad
11(IT)

2. Modern Periodic Law
 The periodic table had first been created been created by Mendeleev. When he
developed his periodic table chemists knew nothing about the internal structure of
atom.
 The physical and chemical properties of elements are the periodic function of their
atomic weights.
 In 1913 the English physicist, Henry Moseley observed that the atomic no is a more
fundamental property of an element than its atomic mass. Mendeleev ‘s periodic law
was therefore accordingly modified.
 This came to be known as the modern periodic law. The modern periodic law states
that the physical and chemical properties of elements are the periodic function of their
atomic numbers.

3. Modern Periodic Law
 The modern periodic table consists of horizontal rows called periods and vertical
columns called groups.
 The modern periodic table has 7 periods and 18 columns. Elements having similar outer
electronic configuration in their atoms are arranged in vertical columns referred to as
groups or families. There are altogether 7 periods.
 The period number corresponds to the highest principal quantum number(n) of the
elements in the period. The first period contains 2 elements. The subsequent periods
consists of 8,8,18,18 and 32 elements respectively.
 The seventh period is incomplete. Lanthanoids and actinoids are placed in the bottom
of the periodic table.

4. Dmitri Mendeleev
Dmitri Ivanovich Mendeleev was a
Russian chemist and inventor. He
formulated the Periodic Law, created a
farsighted version of the periodic table
of elements, and used it to correct the
properties of some already discovered
elements and also to predict the
properties of eight elements yet to be
discovered.

5. Henry Moseley
Henry Gwyn Jeffreys Moseley was an
English physicist, whose contribution to
the science of physics was the
justification from physical laws of the
previous empirical and chemical concept
of the atomic number.

7. Nomenclature of Elements only for Atomic nos. >100
 Chemical elements are named after various things. Sometimes it is based on the person who
discovered it, or the place it was discovered. Some of them have Latin or Greek roots meaning
something related to the element, for example what it was used for. There is some debate over
what unnamed (due to being hypothesised or newly discovered) elements should be named -
whether a number (e.g. 117), a transliterated number (e.g. ununseptium), or a placeholder name.
 Several of the elements with the highest atomic numbers (113 and higher) do not have a formal
name, but are instead named using a mixture of Greek and Latin roots referring to the element's
atomic number. Examples of such elements include ununtrium, ununpentium, ununseptium, and
ununoctium. This system was first created in 1979.

8. Nomenclature of Elements only for Atomic nos. >100
 In 1979, IUPAC published recommendations for their systematic element names to be used for
yet unnamed or undiscovered elements as a placeholder, until the discovery of the element is
confirmed and a permanent name is decided on. The recommendations are mostly ignored
among scientists, who simply call these elements by their atomic number Z, for example
"element 117" (instead of "ununseptium"), with the symbol of (117) or even simply 117.

9. Notation of
elements for IUPAC
nomenclature of
elements

10. Nomenclature
of elements
with atomic
number > 100