Question

Explain Mendeleev perodic table class -X​

Answer 1

mendeleev periodic table based atomic mass they clarify atom on the bases of atomic mass

and they leave some space in their table because at that time element are not delivered they give name to the blank box as eka silicon etc

but they can't justify the position of hydrogen and the properties of isobars

Answer 2

1) The modern periodic table consists seven horizontal rows called the periods 1 to 7. 2) Similarly , the eighteen vertical columns in this table are the groups 1 to 18. 3) Apart from these seven rows,two rows are shown seprately at the bottom of the modern periodic table.These are lanthanide series and actinide series respectively. 4) Entire periodic table is divided into 4 blocks namely ; s- block , p- block , d - block, f - block. 5) The three traditional types of elements are clearly shown in the table. 6) The metalloid elements lie along the border of the zig zag line. All the metal lies on the left side of this zig zag line while all non metals lie along tje right side of the zig zag line.