Question

35.
how did the position of Cl and
17.
37
Cl get fixed in the modern
17
periodic table ?

Answer 1

can u be clear plz I'm not able to understand ur question

Answer 2

Correct Question:

How did the position of $\sf\:^{35}_{17}Cl\:\&\:^{37}_{17}Cl$ get fixed in the modern periodic table?

Answer:

$\sf\:^{35}_{17}Cl\:\&\:^{37}_{17}Cl$ are the two isotopes of chlorine fixed in the modern periodic table.

Explanation:

1. When Mendeleev made his periodic table, he used atomic mass of elements to classify them.

2. The difference between atomic masses of two consecutive elements is not the same in $\sf\:^{35}_{17}Cl\:\&\:^{37}_{17}Cl$.

3. While, Henry Moseley found out the atomic number of the elements.

4. The difference between the atomic numbers of two consecutive elements is one unit.

5. Isotopes of chlorine $\sf\:^{35}_{17}Cl\:\&\:^{37}_{17}Cl$ occupy the same position in the modern periodic table.

6. As they are the isotopes, they both have the same atomic number.

7. Mendeleev arranged the elements on the basis of atomic mass and therefore, isotope couldn't be classified well.

8. But, Moseley arranged the elements in the modern periodic table on the basis of atomic number and therefore the problem of classification of isotopes is solved.

9. In this way, the isotopes $\sf\:^{35}_{17}Cl\:\&\:^{37}_{17}Cl$ were placed in the same group as both have the same atomic number.