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One of the earliest attempts to organize the elements based on their chemical and physical properties was made by German chemist Johann Dobereiner. In 1817 Dobereiner noticed that certain elements that were chemically similar could be grouped together in threes, for example, calcium, strontium, and barium; lithium, sodium, and potassium; chlorine, bromine, and iodine. In each group of three, the atomic weight of one element fell halfway between the atomic weights of the other two elements. The pattern seemed too remarkable to be a coincidence. Based on his findings, Dobereiner proposed the Law of Triads in 1829. His work soon prompted other scientists to find patterns among even larger groups of elements.
Today, the Periodic Table organizes the elements in horizontal rows, or periods, by order of increasing atomic number, which equals the number of protons in the atomic nucleus of each element. The elements are also organized in vertical columns, or groups, based on similar physical characteristics and chemical behavior. This arrangement developed side by side with atomic theory over about 200 years, and it continues to evolve as new elements are discovered.
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How was mendeleevs periodic table like todays periodic table?
Mendeleev's periodic table arranged elements by increasing atomic mass and grouped elements with similar properties together. Today's periodic table is similar, but it is arranged by increasing atomic number, which reflects the number of protons in an atom's nucleus. Both tables also show periodic trends in properties as you move across and down the table.
How were elements arranged on the early Periodic Table of Elements?
before it there was no organization, but the first periodic table was organized by atomic mass.
How does one recognize a periodic trend on a periodic table?
One can recognize a periodic trend on the Periodic Table by observing properties of different elements from the left side to the right side of the periodic table.
How does one recognizes a periodic trend on the periodic table?
One can recognize a periodic trend on the Periodic Table by observing properties of different elements from the left side to the right side of the periodic table.
Different forms of periodic table?
I think there should be different forms of periodic table because there is a lot of elements that is not yet discovered.
What are the different ways the elements in the periodic table are classified?
Periodic table can be classified as:MetalsTransition elementsNon-metalsThey occupy different groups.
What are the different features of periodic table?
- the periodic table is organized in periods and groups- chemical elements are listed in the order of the atomic number- the periodic table obey the law of periodicity
Did a Russian the early periodic table?
The arrangement of chemical elements into the widely recognised periodic table was first devised by the Russian chemist Dimitri Mendeleev.
What are the different rows of elements in the periodic table called?
The rows of elements in the periodic table are called periods. There are a total of 7 periods in the periodic table, each representing a different energy level or shell in which the elements' electrons are arranged.
How much periods does a periodic table have?
A periodic table has seven periods. It also has 18 groups and 4 different families.
What does the periodic table describe about an element?
Periodic table describes the symbol, atomic number, mass number of different elements in general.
Which table has different elements arranged by common properties in rows and columns?
The periodic table of elements is the table that arranges different elements based on their common properties in rows and columns. It helps to organize and classify elements by their atomic number, electron configuration, and chemical properties.
