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In Mendeleev's periodic table, elementa are arranged according to their........
Atomic weight
There are ............ elements in the modern periodic table
118
In Moseley's periodic table, elements are arranged according to their .........
Atomic number
Elements in the periodic table are arranged in vertical columns called ............
groups
ELements in the periodic table are arranged in horizontal rows called ...........
Periods
In modern periodic table, elements are arranged according to their .........
atomic number and the way the electrons fill the energy subshells
He discovered that the atom has positively charged protons in its nucleus.
Rutherford
Mendeleev dealt with the isotopes as different elements because they have ...............
different atomic weight
He discovered the main energy levels in the atom.
Bohr
The number of energy levels reaches ........... in the heaviest atom.
seven
The modern periodic table contains ........ periods and .......... groups.
7-18
The modern periodic table is classified into ......blocks, which are
4,s,p,d,f
The s-block is located on the ........... side,contains ......... groups, which are ......& ..........
left
The p-block is located on the ........... side,contains ......... groups, which are ......
right- 6- 3A,4A,5A,6A,7A,0
The d-block is located in the ........... of the periodic table,contains ......... groups, which are ......
middle-10
The f-block is located ........... the periodic table, cosists of ......... horizonatal series, which are ......
below-2-lanthanides and actinides
