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प्रश्न
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
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उत्तर
- Element A is lithium (Li).
Element B is neon (Ne). - Atomic number of element A is 3.
Atomic number of element B is 10.
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संबंधित प्रश्न
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Give two example of group 18 elements.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
State how the valency of elements varies in a group of the periodic table?
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Define:
Periodic table
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Name two elements in Inert gas.
Name the type of elements which have one electron short of octet.
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Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
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Give the symbol and valency of the following element and radical.
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Ammonium
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Fill in the blank:
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Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
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The modern periodic table has 1 to 7 periods.
Write an Explanation.
Period
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It has a similar structure to diamond.
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Spot the error:
The elements of group 13 are called the carbon family.
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Name the non-metals in the first twenty elements.
What is the general name of the last elements of the Periodic Table?
