Name: Kyodi Pitter
Johann Dobereiner:
Subject: Chemistry
Who is Johann Doberiner? Johann Wolfgang
Doberiner was a German chemist who was
best known for work that foreshadowed the
periodic law for the chemical elements.
Date: 21/2/22
Teacher: Miss Scott
element could be predicted from the
properties of the other two.
Dmitri Mendeleev:
Who is Dmitri Mendeleev? Dmitri
Mendeleev was a Russian chemist and
inventor. He is best known for formulating
the periodic the periodic law and creating a
farsighted version of the periodic table
elements.
Grade: 9N
Contribution to the periodic table
His inventions: he invented the first lighter,
which was known as the Doberiners lamp.
Date of birth
He was born December 13, 1780 and died
March 24, 1849
His contribution to the periodic table: in
1829 Johann Doberenier recognised traits of
elements with chemically similar properties,
such as lithium, sodium and potassium, and
showed that the properties of the middle
His invention? Periodic table, pycnometer,
pyrocollodion
Date of birth? February 8, 1834 and died
February 2, 1907
John newlands:
His contribution to the periodic table?
Dmitri Mendeleev developed the periodic
classification of the elements. Mendeleev
found that, when all known chemical
elements were arranged in order of
increasing atomic weight, the resulting table
displayed a recurring pattern, or periodicity,
of properties within the groups of elements.
Who is john newlands? John newlands was
an English chemist law of octaves noted a
pattern in the atomic structure of elements
with similar chemical properties.
His understanding: he understand the major
properties of an element are determined by
the atomic number not by the atomic
weight.
Henry Moseley:
Who is henry Moseley? Henry Gwyn
Jeffrey’s 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.
Date of birth: November 23, 1887 and died
august 10, 1915
His contribution to the periodic table: in
1913 he used self-built equipment to prove
that every elements identify is uniquely
determined by the number of protons it has.
His discovery revealed the true basic of
periodic table and enabled Moseley to
predict confidently the existence of four
new chemical elements. Technetium,
promethium, hafnium and rhenium. All
which were found.
Date of birth:
Born November 26, 1837 and died July 29,
1898
His contribution to the periodic table:
John newlands was the first to arrange the
elements into a periodic table with
increasing order of atomic masses. He found
that every eight elements had similar
properties and called this law of octaves. He
arranged the elements in groups but left no
gaps for undiscovered elements