What is base of long form of periodic table?
The correct option is B atomic number. According to modern periodic law, atomic number forms the basis of the construction of modern periodic law.
How many periods are there in long form of periodic table?
There are seven horizontal rows in the periodic table corresponding to seven periods.
How many elements are present in the long form of periodic table?
118 Elements are present in the Periodic Table.
What are features of long form of periodic table?
Long form of periodic table consists of horizontal rows and vertical columns. Horizontal row is termed as period while vertical column is called group. Periods: The long form of the periodic table consists of total seven periods.
How many periods are called short periods?
Hence, the first three periods are called as short periods. So, total of 3 short periods are there in Mendeleev periodic table.
Who made the long form of periodic table?
Neils Bohr developed the long form or modern form of periodic table on the basis of Moseley’s principle.
Which is the longest period?
The sixth period
The sixth period contains 32 elements ( Cs to Rn ) and is also known as the longest period. The first period contains only two elements H and He and is known as the shortest period.
What are the 7 periods of periodic table?
These families are alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, halogens, noble metals, and noble gases.
Who wrote the periodic table?
chemist Dmitri Mendeleev
In 1869, Russian chemist Dmitri Mendeleev created the framework that became the modern periodic table, leaving gaps for elements that were yet to be discovered.
Who made periodic table?
Dmitri MendeleevPeriodic table / Inventor
Who developed the long form of periodic table?
In 1869, Russian chemist Dmitri Mendeleev arranged 63 elements by increasing atomic weight in several columns, noting recurring chemical properties across them. It is sometimes said that he played “chemical solitaire” on long train journeys, using cards with the symbols and the atomic weights of the known elements.
What are the disadvantages of long form of periodic table?
The arrangement of element is based on a more fundamental basis,atomic number.
How long did it take to complete the periodic table?
Russian chemist Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table.
What determines the length of the periodic table?
– The relatively small Li + ions pack in the holes between the much larger I – ions, as shown in the figure below. – The relatively large I – ions touch one another. – The Li + ions touch the I – ions.
Who developed the long form of modern periodic table?
Mendeleev’s periodic table is based on atomic mass.