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प्रश्न
Write a scientific reason.
Metallic character goes on decreasing while going from left to right in a period.
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उत्तर
- An atom's metallic nature is characterised by its propensity for losing electrons.
- Electrons are added to the same outermost shell as they move from left to right over time. At the same time, protons are added to the nucleus, increasing its charge.
- As a result of the higher effective nuclear charge, these electrons are attracted to the nucleus more strongly.
- As a result, it is more difficult to remove a valence electron from an atom.
Hence, metallic character goes on decreasing while going from left to right in a period.
संबंधित प्रश्न
In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:
The element B would have ______ metallic character than A.
Answer the following in respect of element `31/15 P `
Is it a metal or non - metal
Explain the following:
Metallic character of elements decreases from left to right in a period while it increases in moving down a group.
Complete the following sentences
Moving across a ………….. of the periodic table the elements show increasing ………………..character (group, period, metallic, non-metallic).
Explain why the following statement is not correct:
All groups contain metals and non metals.
iii) Observe the figure and answer the following questions.
a) Identify the block shown by box A and write an electronic configuration of any one element of this block.
b) Identify the block of element denoted by letter B and write its period number.
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
Group 17 elements are non-metals, while group 1 elements are metals.
Match the atomic number with the following:
A metal of valency one.
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.
Arrange the following elements in order of their decreasing metallic character.
Na, Si, Cl, Mg, Al
On moving down the group metallic character increases.
Write an explanation.
Electropositivity
Write scientific reason.
The metallic character of elements increases while going down the groups.
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?
Which of the following sets of atomic numbers belong to that of alkali metals?
Choose the odd one out and write the reason:
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing metallic character)
