what are the main features of Mendeleev's periodic table
Answers
Explanation:
The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7. There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right. The periodic table is composed of eight vertical columns or groups. They are numbered between 1 to 8.
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Answer:
Main features of Mendeleev's Periodic Table:
(a) There are seven horizontal rows in the periodic table. They are called periods and are numbered from 1 to 7.
(b) In a given period, there is a regular gradation in the properties of elements from left to right.
(c) There are eight vertical columns in the periodic table. These are named as groups. They are numbered from I to VIII. Groups I to VII are subdivided into subgroups A and B.
(d)The group numbers were indicated by Roman numerals. Group VIII occupy three triads of the elements each i.e. in all nine elements.
(e)There were seven periods to accommodate more elements the period 4, 5, 6 and 7 were divided into two halves. The first half of the elements were placed in the upper left corner and the second half in the lower right corner of each box