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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
What is the number of elements is 1st period the modern periodic table?
Name the scientist who stated the modern periodic law.
Name the type of elements which have outermost shell incomplete.
Name the type of elements which have two electrons in the outermost orbit.
State the modern periodic law.
Give the symbol and valency of the following element and radical.
Potassium
Give the chemical formula of magnesium nitrate
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.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has variable valency and is a member of the Oxygen family (group 16).
