Advertisements
Advertisements
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.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Mention the basic tendency of an atom which makes it to combine with other atoms.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Sodium chloride is ______ compound while hydrogen chloride is ______ compound.
State the following is a reduction reaction or oxidation reaction.
\[\ce{Cu -> Cu^2+}\]
What is the contribution of the following in atomic structure?
Democritus
Why do `""_17^35"CI"` and `""_17^37"CI"` have the same chemical properties? In what respect do these atoms differ?
Complete the following table relating to the atomic structure of some elements.
|
Element Symbol |
Atomic Number |
Mass Number |
Numbers of neutrons |
Number of Electrons |
Number of Protons |
|
Li |
3 |
6 |
|
|
|
|
Cl |
17 |
|
20 |
|
|
|
Na |
|
|
12 |
|
11 |
|
Al |
|
27 |
|
|
13 |
|
S |
|
32 |
16 |
|
|
State the type of bond between Y and Z and give its molecular formula.
Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.
The valency of noble gases is ______.
Complete the following table:
| Atoms | Atomic number | Electron distribution | |
| 1. | O | 8 | ______ |
| 2. | N | ______ | ______ |
| 3. | ______ | 17 | ______ |
| 4. | ______ | ______ | 2,8,2 |
