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प्रश्न
State the property trends in general of elements on moving down in a group of the periodic table.
उत्तर
Trends in a group:
- Number of shells and valence electrons: As we move down in a group the number of shells increase and valence electrons in a group remains the same.
- Valency: Valency of all elements is the same.
- Properties of elements:
(a) Metallic character increases,
(b) Non-metallic character decreases - Atomic size increases.
`"F>Cl>Br>I"/"Reactivity decreases"`
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संबंधित प्रश्न
Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.
Name the element that has two shells, both of which are completely filled with electrons.
Match the atomic number 2, 4, 8, 15 and 19 with each of the following
1) A solid non metal belonging to the third period.
2) A metal of valency 1.
3) A gaseous element with valency 2.
4) An element belonging to Group 2
5) A rare gas.
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table:
(a) group 4
(b) group 14
(c) group 15
(d) group 16
An element X belong to 3rd periods and group II of the periodic table state:
the valency,
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl with metal ‚A‛.
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
Moving down in the second group, number of valence electrons ______.
