Question

out of fluorine and hydrogen which element has larger atomic size give reason for your answer​

Answer 1

Answer:

Fluorine

Explanation:

out of hydrogen and fluorine fluorine have large atomic size because atomic size depends on atomic radius of element .Hydrogen belongs to group 1 and period 1 having only one cell (k cell ) while fluorine belongs to group 17 and period 2 .The atomic radius become large down the period due to increase in cell number so flourine have two cell and are larger .

Answer 2

Answer:

Fluorine.

Explanation:

Electronic configuration of Hydrogen = 1

Electronic configuration of Fluorine = 2, 7

Now, we can see that hydrogen has only shell, that is K shell, for its atom but Fluorine has 2 shells (K shell and L shell).

Since, fluorine has one more shell in its atom, it's atomic radius will be more. Hence, the size of it's atom would be more than that of hydrogen.

$\rule{200}1$

★ Atomic size increases with increasing number of shells

★ Atomic size decreases with increasing atomic number for a fixed number of shell.

Example, Li has electronic configuration 2,1 and Boron has 2, 3. Since, the number of shells is same but number of electrons in B is more than in Li, the nuclear force of the nucleus of atom of B would be more than Li. As a result, the electrons would be closer to nucleus in B than in Li. Hence, the atomic size of B would be less than Li.

★ Atomic size decreases across a period in periodic table.

★ Atomic size increases down a group in periodic table.