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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 instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing order of metallic character).
Answer the following in respect of element `31/15 P `
What is its valency?
Name any five periods properties.
Name the periodic property which relates to the character of element which loses one or more electrons when supplied with energy.
Which has the maximum metallic character Na, Li or K?
A metal M forms as oxide having the formula M2O3. It belongs to third period. Write the atomic number and valency of the 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
State whether the following statement is true or false
All members of zero group are non metals.
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 tendency of an element to form cation is the _______ character of that element.
Write an Explanation.
Electronegativity
Write scientific reason.
The metallic character of elements increases while going down the groups.
The lightest liquid metal is ______
Three elements B, Si and Ge are
Identify the elements with the following property and arrange them in increasing order of their reactivity
- An element which is a soft and reactive metal
- The metal which is an important constituent of limestone
- The metal which exists in liquid state at room temperature
Choose the odd one out and write the reason:
Arrange:
Be, Li, C, B, N, O, F (in increasing metallic character).
