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प्रश्न
What is the main characteristic of the last element in each period of the periodic table?
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.
संबंधित प्रश्न
What is periodicity in properties of elements with reference to the Modern Periodic Table?
What are the periods in a periodic table? Give two characteristics of each.
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
Name the type of elements which have one electron short of octet.
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Give the chemical formula of sodium hydroxide
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
The K and L shells of the elements Na and Mg contain electrons.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
The inert gas which lies in the third period is ______
