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15
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G.R/mendleev would have to deal with isotopes of one element which were discovered later as different elements
Due to the difference in their atomic weights
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25
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How did mendleev classify elements
.......
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10
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Who is the scientist that discovered that nucleucs of the atom contains positively charged protons
Rutherford
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15
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G.R / mendleev had to make disturbance in the ascending order of atomic weights of some elements
To put them in groups that suits their properties
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20
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What are the advantages of Mendleev's periodic table
......
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5
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Complete / the modern periodic table consists........ vertical groups
18
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monster
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magnet
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fairy
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25
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baam
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20
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What are the disadvantages of Mendleev's periodic table
....
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5
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How many elements was in mendleev's periodic table
67
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eraser
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star
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fairy
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thief
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10
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A table in which the elements are arranged in an ascending order according to their atomic numbers
Moseley's periodic table
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seesaw
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magnet
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fairy
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banana
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10
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The scientist who left empty cells in the table to be filled with discovered elements in future
Mendleev
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5
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The number of known elements in modern periodic table till now is
118
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15
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What are the most important attempts
Mendleev's periodic table, moseley's periodic table and the modern periodic table
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5
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complete / The modern periodic table consists of........ horizontal periods
7
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