Question

the place of which element remains indefinite in periodic table 4 answer chahiye​

Answer 1

Answer:

The place of Hydrogen ( H ) remains indefinite in the modern periodic table.

Explanation:

1. Hydrogen shows some different properties than the other elements.

2. Hydrogen has some properties of group I elements while some are of group VII.

3. It acts like halogens ( group VII ) in case of its molecular formula.

4. The molecular formula of hydrogen is $\sf\:H_2$.

5. The molecular formulae of chlorine and fluorine which belong to group VII are $\sf\:Cl_2\:\&\:F_2$ respectively.

6. Like this, hydrogen has some similarities in chemical properties with the alkali metals ( group I ).

7. Alkali metals react with chlorine and oxygen.

8. There is similarity in the molecular formula of alkali metals and hydrogen with chlorine and oxygen.

9. Due to such properties, it has become difficult to place hydrogen in the correct place.

10. Hence, the place of hydrogen remains indefinite in the modern periodic table.

11. Similarity in hydrogen and alkali metals:

$\begin{array}{|c|c|} \cline{1-2}\sf\:Compounds\:of\:H & \sf\:Compounds\:of\:Na\\\cline{1-2}\sf\:HCl & \sf\:NaCl\\\cline{1-2}\sf\:H_2O & \sf\:Na_2O\\\cline{1-2}\sf\:H_2S & \sf\:Na_2S\\\cline{1-2}\end{array}$

12. Similarity in hydrogen and halogens:

$\begin{array}{|c|c|c|}\cline{1-3}\sf\:Element\:(\:Molecular\:formula\:) & \sf\:Compounds\:with\:metals & \sf\:Compounds\:with\:nonmetals\\\cline{1-3}\sf\:H_2 & \sf\:NaH & \sf\:CH_4\\\cline{1-3}\sf\:Cl_2 & \sf\:NaCl & \sf\:CCl_4\\\cline{1-3}\end{array}$

Answer 2

Explanation:

The reproduction which is huge is Asexual reproduction.

hope this helps you