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प्रश्न
Write scientific reason.
The metallic character of elements increases while going down the groups.
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उत्तर
- While going down a group a new shell gets added, resulting in an increase in the distance between the nucleus and the valence electrons.
- This results in lowering the effective nuclear charge and thereby lowering the attractive force on the valence electrons.
- As a result of this, the tendency of the atom to form cation by losing electrons increases.
- The metallic character of an atom is its tendency to lose electrons.
Hence, the metallic character of elements increases while going down the groups.
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संबंधित प्रश्न
Choose the word or phrase from the brackets which correctly complete the following statement:
Metals are good ______ (oxidizing agents/reducing agents) because they are electron ______ (acceptors/donors).
Arrange the following as per the instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing order of metallic character).
Name any five periods properties.
An element X belong to 3rd periods and group II of the periodic table state:
whether it is a metal or a non-metal.
Explain why the following statement is not correct:
All groups contain metals and non metals.
Among the elements of the second period, Li to Ne, pick out the element that is the most reactive non-metal
Among the elements of the second period, Li to Ne, pick out the element that is the most reactive metal
Explain
Larger the atomic size, more metallic is the element.
Within a group, where would you expect to find the element with the greatest metallic character.
Use the information given in (a) to (h) to identify the substances P to W selecting your answers from the given list.
| List | ||
| Calcium | Oxygen | Copper (II) Oxide |
| Carbon | Calcium hydroxide | Copper (II) Nitrate |
| Lead (II) Oxide | Hydrogen chloride | Chlorine |
| Lead (II) Nitrate | Calcium Oxide | Ammonium chloride |
- P is white solid. When heated produces white fumes (sublime).
- P and R on warming produce an alkaline gas.
- On adding water to T, heat is evolved and R is formed.
- Q burns brightly in the air to form T.
- When S is heated, it gives off brown fumes and leaves a black residue of U.
- A solution of S is formed by warming U with dilute nitric acid.
- V is a gaseous non-metallic element that reacts with hydrogen to form W.
- A solution of W will neutralize the solution of R.
Write the name.
The atom having the smallest atomic radius from zero group.
Electronegativity is the metallic property of an element.
Write a scientific reason.
The non-metallic character increases while going from left to right in a period.
Which of the following set of elements is written in order of their increasing metallic character?
The lightest liquid metal is ______
An element has atomic number 17. To which group, the period does it belong? It is metal or non-metal?
Which of the following sets of atomic numbers belong to that of alkali metals?
Which of the following metal (s) do not react with water?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
