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Question
Name the scientist who prepared modern periodic table.
Solution
Henry Moseley prepared the modern periodic table.
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RELATED QUESTIONS
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
On the basis of electronic configuration, how will you identify the first element of a period?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Bisulphite
Write an Explanation.
Period
Complete the following flow chart.
How does the property vary in periods and in groups?
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
