Question

characteristics of morden period tables​

Answer 1

Explanation:

The long form of periodic table consist of vertical columns called groups and horizontal rows called periods. Elements are arranged in the increasing order of atomic numbers. Elements in the modern periodic table are arranged in 7 periods and 18 groups

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Answer 2

Answer:

The long form of periodic table consist of vertical columns called groups and horizontal rows called periods. Elements are arranged in the increasing order of atomic numbers. Elements in the modern periodic table are arranged in 7 periods and 18 groups.

Explanation:

The First Periodic Table. In the 1860s, a scientist named Dmitri Mendeleev also saw the need to organize the elements. He created a table in which he arranged all of the elements by increasing atomic mass from left to right across each row.

The periodic table is the most important chemistry reference there is. It arranges all the known elements in an informative array. Elements are arranged left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass.

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