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प्रश्न
Match the atomic numbers 4, 14, 8, 15 and 19 with each of the following:
- A solid non-metal of valency 3.
- A gas of valency 2.
- A metal of valency 1.
- A non-metal of valency 4.
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उत्तर
| Name with valency | Atomic Number |
| 1. A solid non-metal of valency 3 | 15 |
| 2. A gas of valency 2 | 8 |
| 3. A metal of valency 1 | 19 |
| 4. A non-metal of valency 4 | 14 |
Explanation:
-
As atomic number 15 has an electronic configuration [2, 8, 5], it is a non-metal having 5 electrons in the valence shell and needs three electrons to complete its octet so it has a valency of 3.
-
As atomic number is 8, so it has the electronic configuration of [2, 6] and it needs 2 electrons to complete its octet hence, it is a gas of valency 2.
-
As atomic number 19 has an electronic configuration [2, 8, 8, 1], so it is a metal having 1 electron in the valence shell and donates its one electron to complete its octet so it has a valency 1.
-
As atomic number 14 has electronic configuration [2, 8, 4], so it is a non-metal having 4 electrons in the valence shell and needs four electrons to complete its octet so it has a valency 4.
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संबंधित प्रश्न
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2, 8, 1 |
2, 8, 7 |
2, 5 |
1 |
Answer the following question based on the table above:
What is the formula of the compound formed between W and X.
State the type of bonding in the following molecule.
Calcium oxide
How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration?
Explain
Octet rule for the formation of sodium chloride
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^23_11Na}\]
Draw the electron distribution diagram for the formation of Carbon di oxide (CO2 ) molecule.
What is a chemical bond?
Complete the following table:
| Atoms | Atomic number | Electron distribution | |
| 1. | O | 8 | ______ |
| 2. | N | ______ | ______ |
| 3. | ______ | 17 | ______ |
| 4. | ______ | ______ | 2,8,2 |
The one which is composed of all the three kinds of bond.[ionic, covalent and coordinate bond]
