Question

The ratio between radii of he+ ion and h atom is

Answer 1

Answer:

1/2

Explanation:

According to Bohr's model of H like atoms (having one electron)

r = n²h²/Zke²me

Radius of orbit r = n²h²/4π².me²*1/Z =0.529*n²/ZÅ

For He+ ion Z=2

For H, Z=1

Now

Radius of He+ = 0.529*n²/2 Å

Radius of H = 0.529*n² Å

Therefore Ratio b/w radii of He+ ion to H atom is 1/2

Answer 2

Answer:1/2

Explanation: because size is directly proportional to number of electrons and inversely proportional to number of protons.