Advertisements
Advertisements
प्रश्न
How many electrons are required or released by each atom in calcium oxide to attain the nearest noble gas configuration?
Advertisements
उत्तर
In Calcium oxide, oxygen needs 2 electrons.
संबंधित प्रश्न
Give electron dot diagram of the following:
methane
Among the following compounds identify the compound that has all three bonds (ionic, covalent and coordinate bond).
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.
Choose the correct option
Which of the following is the correct electronic configuration of potassium?
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 |
|
|
Potassium (at No.19) and chlorine (at No.17) react to form a compound. Explain the formation of the compound on the basis of oxidizing agent.
Explain the following:
Carbon-12 and carbon-14 both show similar chemical properties.
Complete the table give below.
| Element |
Atomic number |
Electron distribution | Valence electrons | Lewis dot structure |
| Lithium | 3 | 1s22s1 | ||
| Boron | 5 | 1s22s22p1 | ||
| Oxygen | 8 | 1s22s22p4 |
______ is the only noble gas that does not have eight electrons in its valence shell.
How many atoms of each kind are present in the following molecule:
water
