Air is a mixture because it is made up of many constituents like oxygen, argon etc. it can be physically separated by fractional distillation. it doesnt have a formula unlike compounds and elements. its composition varies differently with its constituents.
Answer:
Ground state electronic configuration of oxygen atom is as follows - is 1s2 2s2 2p2x 2p1y 2p1z 1s2 2s2 2px2 2py1 2pz1
Ground state electronic configuration of hydrogen atom is 1s1 1s1
Explanation:
As per the Valence Bond Theory (VBT),
Ground state electronic configuration of oxygen atom is as follows - is 1s2 2s2 2p2x 2p1y 2p1z 1s2 2s2 2px2 2py1 2pz1
Ground state electronic configuration of hydrogen atom is 1s1 1s1
Considering the electronic configuration, H-O-H bond angle would be at 90 degrees as 2py2py and 2pz2pz are oriented 90° with respect to each other. But if the oxygen atomic orbitals is used directly then bond angle for water is 104.45° as per the VSEPR theory which states that 2s2s spherical orbit in oxygen can adjust the bond angle by creating new hybrid orbitals
The half life of 131 i is 8.06 days
calculation
by use of concentration time equation for radioactive decay
In Nt/No = -Kt
where Nt/No is the fraction of the sample remaining at time T
convert 50.2% in decimal = 50.2/100 = 0.502
therefore = In 0.502 = - K 8.0 t
- 0.689 =-8.0 k
divide both side by 8.0
K = 0.860
t1/2 = 0.693/K
t1/2 = 0.693/0.860 = 8.06 days
Answer:
gamma decay.
Explanation:
A gamma decay emits only a gamma-ray photon,