Question

please solve this question​ it's a request it is related to chemistry and what is r in the question

Answer 1

Answer:

hope you understand

Explanation:

thank you

Answer 2

Answer:

$\boxed{ \blue{ \frac{4}{25} }}$

Explanation:

It is hydrogen like specie so Bohr calculation can be applied.

according to bohr

$radius = 0.529 × \frac{n^2}{z} A ^\circ$

where n = shell no

Z = atomic no

so,

$\frac{r2}{r5} = \frac{0.529 \times \frac{ {2}^{2} }{z} }{0.529 \times \frac{ {5}^{2} }{z} } = \frac{4}{25}$

here r is radius in question

some other important results

remember these directly

it's too long to drive

$\diamond \: \: \: v = 2.188 \times {10}^{6} \times \frac{z}{n} \: \: m {s}^{ - 1} \\ \\ \diamond \: \: \: total \: energy \: = \: - 13.6 \times \frac{ {z}^{2} }{ {n}^{2} } \: ev \: per \: atom \: \\ \\ \diamond \: kintic \: energy \: = \: - \: total \: energy \\ \\ \diamond \: potential \: \: energy \: = \: 2 \: total \: energy \: \: \\ \\ \\ cheers$