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प्रश्न
How many groups and periods does the modern periodic table have?
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उत्तर
The modern periodic table consists of seven horizontal rows and eighteen vertical columns.
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
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.
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
An element A has 2 electrons in its fourth shell. State its electronic configuration.
Give the chemical formula of sodium hydroxide
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
What are the periods in a periodic table?
To the left of the zig-zag line in the periodic table are the metal elements.
State any five features of modern periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
