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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
Arrange the following as per the instructions given in the brackets:
Cl, F, Br, I (increasing order of electron affinity)
Give the trend in metallic character:
down the group top to bottom.
Explain the following:
Group 17 elements are strong non-metals, while group 1 elements are strong metals.
How does the chemical reactivity of
alkali metals vary?
Complete the following sentences
Moving across a ………….. of the periodic table the elements show increasing ………………..character (group, period, metallic, non-metallic).
Among the elements of the second period, Li to Ne, pick out the element that is the most reactive metal
For the main group of the periodic table, the metallic properties of the elements vary approximately with their position as shown in the table.
| 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| H | He | ||||||
| A | B | ||||||
| C | D |
- Will the most metallic element be found at A, B, C or D?
- Will the most non-metallic element be found at A, B, C or D?
Explain
Group 17 elements are non-metals, while group 1 elements are metals.
Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The element at the bottom of a group would be expected to show ______ metallic character than the element at the top.
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.
The metallic character of the element decreases moving across a period from left to the right.
On moving down the group metallic character increases.
Write an explanation.
Electropositivity
Write an explanation.
Electronegativity
Which of the following set of elements is written in order of their increasing metallic character?
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?
Three elements B, Si and Ge are
Which of the following metal (s) do not react with water?
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing metallic character)
