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प्रश्न
3, 1, 2 electrons are in valence shells of X, Y, Z elements resp. From this information, write the name of the groups it belongs to and its valency.
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उत्तर
| Valence shell electron(s) |
Group | Valency |
| 3 | 13 | 3 |
| 1 | 1 | 1 |
| 2 | 2 | 2 |
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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).
Answer the following in respect of element `31/15 P `
What is its valency?
Metallic character and non-metallic character are periodic properties discuss ?
Give the trend in metallic character:
(i) across the period left to right
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 non-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 | 3 | 4 | 5 | 6 | 7 | 8 |
| H | He | ||||||
| A | B | ||||||
| C | D |
Will the most non-metallic element be found at A,B,C or D ?
State whether the following statement is true or false
All members of zero group are non metals.
Explain
Larger the atomic size, more metallic is the element.
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
Electropositivity means ______.
Right or wrong sentence.
Silicon is a metallic element.
Electronegativity is the metallic property of an element.
Write an explanation.
Electronegativity
Write scientific reason.
The metallic character of elements increases while going down the groups.
The metal which is hard and has a high melting point and used in filaments of electrical bulbs is ______
Arrange the following as per instruction given in the bracket.
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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.
