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प्रश्न
Right or wrong sentence.
Silicon is a metallic element.
पर्याय
Right
Wrong
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उत्तर
The given sentence is wrong.
Explanation:
Silicon is a metalloid (a semimetal); it has properties intermediate between metals and nonmetals rather than being a true metallic element. For how metallic character is decided (why silicon sits along the metal/nonmetal border), see the explanation of periodic trends and metalloid placement.
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संबंधित प्रश्न
Answer the following in respect of element `31/15 P `
Is it a metal or non - metal
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
- Is it a metal or a non-metal?
- Is it more or less reactive than calcium?
- What is its valency?
- What will be the formula of its phosphate?
- is it larger or smaller than caesium (Cs) in size?
The electronic configuration of an element T is 2, 8, 8, 1.
Is it a metal or a non-metal?
Which has the maximum metallic character Na, Li or K?
Choose the correct answer.
An alkaline earth metal
(i) Lead
(ii) potassium
(iii) calcium
(iv) Copper
In Period 3, the most metallic element is ______.
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 ?
Select the correct answer
Configuration of an element is 2, 8, 1. Which of the following statement is true?
Refering to changes in the properties of elements on moving from left to right across a period of the periodic table. Choose the correct answer.
The non-metallic character of the elements :
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
Write an explanation.
Electronegativity
A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
The metal which is hard and has a high melting point and used in filaments of electrical bulbs is ______
The lightest liquid metal is ______
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?
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
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.
