Question

C.
Give reasons.
1. Argogasn is an inert gas.
2. The valency of nitrogen is 3.
3. Chlorine is an active non-metal.
4.
Fluorine is more reactive than chlorine.
5. Sodium is less reactive than potassium.
6. The members of group IA are called alkali metals.
7. The group I elements are very active.
Lanthanides and actinides are kept separately in the modern peri
9. Transition elements have variable valency.
10. Halogens are active nonmetals.
8.
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CLASSIFICATION OF ELEMENTS​

Answer 1

Answer:

1. Because Argon has a complete octet in its valence shell.

2. Because nitrogen requires 3 electrons to complete its octet.

3. As there are only five electrons in 3p sub shell therefore, in order to obtain stability, chlorine requires to gain only one electron. Therefore, it will react readily with another element who can transfer or share one electron. That is why, chlorine is an active non-metal.

4. Since fluorine has a higher electronegatvity than chlorine, so fluorine is more reactive.

5. The reactivity of alkali metals are due to their large size and low ionization enthalpy which in turn eases the loose of outermost electrons of alkali metals. This is the reason sodium is less reactive than potassium.

6. Because they give alkalis when react with water and are called metals because they lose an electron to complete their octet.

7. Because they have only one electron in valence shell to lose.

8. The reason why Lanthanides and Actinides are located at the bottom of the periodical table is because of their properties and in the block in which electrons fill up. ... They are inner-transition metals located at the bottom of the periodic table, separated from the rest because they all fill the f-block.

9. Transition elements show variable valency due to incomplete filling of f-orbitals.

10. Halogens only require to accept one electron to complete their octet so they are ver active.

Explanation:

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