Advertisements
Advertisements
प्रश्न
Write scientific reason.
The non-metallic character increases while going from left to right in a period.
Advertisements
उत्तर
- While going from left to right in a period, electrons are added to the same outermost shell. At the same time, protons get added in the nucleus increasing the nuclear charge.
- Hence, these electrons experience greater pull from the nucleus due to increased effective nuclear charge.
- As a result, the ability of an atom to become anion by accepting outside electrons increases.
- The non-metallic character of an atom is its tendency to gain electrons.
Hence, non-metallic character increases while going from left to right in a period.
APPEARS IN
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).
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.
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 metal
In the third period, which is the most metallic and most non-metallic element?
Explain
Larger the atomic size, more metallic is the element.
Select the correct answer
Which of the following electronic structure is of a metal?
Supply the missing word from the words given in brackets.
If an element has one electron in its outermost energy level, then it is likely to be _ (metallic, non metallic)
Identify the metallic oxide which is amphoteric in nature.
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.
Electropositivity means ______.
Write the name.
The atom having the smallest atomic radius from zero group.
Which of the following set of elements is written in order of their increasing metallic character?
The metal which is hard and has a high melting point and used in filaments of electrical bulbs is ______
The lightest liquid metal is ______
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?
