Question

what do you mean by periodic table​

Answer 1

Periodic table is an arrangement of chemical elements in a systematic manner.

• There are are large number of chemical elements present which had to be arranged systematically, due to which a periodic table was designed.
• A periodic table consists of rows and columns.
• The horizontal rows are called periods and are 7 in number.
• While the vertical rows are called groups that are 18 in number.
• The elements are arranged according to their atomic numbers.

Answer 2

Periodic Table :  

It is a table in which elements are arranged in the order to make the study of elements simple and systematic.

• Mosley in 1913 provided the modern periodic table.
• In modern periodic table elements are arranged in order of increasing atomic numbers.  
• Modern periodic table has 18 vertical columns called groups and 7 horizontal rows called periods. Groups are not divided further.
• In modern periodic table noble gases are included.  

Learn more:

Which group of elements could be placed in Mendeleev's periodic table without disturbing the original order? Give reason.

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How do the early attempts to classify the chemical elements differ from the modern attempt? Which of the two is better and why? Give examples.

https://brainly.in/question/2106465