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प्रश्न
What is the main characteristic of the last element in each period of the periodic table?
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उत्तर
The last element in each period of the periodic table is a gaseous element with its valence shell completely filled. Except for helium, which has a complete duplet configuration, all five gases have a complete octet configuration.
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संबंधित प्रश्न
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.
The modern periodic table was prepared by ______.
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Give the symbol and valency of the following element and radical.
Potassium
State what is meant by the term chemical formula.
Give the chemical formula of sodium bicarbonate
Which of the following elements does not lose an electron easily?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
