Determine the time required for a 16.00 gram sample of ge-81 to decay until only 1.00 gram of the sample remains unchanged

The time required for a 16.00 gram sample of Ge-81 to decay until only 1.00 gram of the sample remains unchanged

30.4 second

Explanation:

Half-life = It is the time required by the radioactive substance to becomes half of its original value

For Ge

Half-life  = 7.6 s

(it is experimentally determined value)

Calculate how many half-cycles are required to decay 16g  of substance to 1 g

(For this divide the original quantity by 2 each time)

n = number of Half- cycles

Hence total n = 4

1 half - cycles = 7.6 s

4 half-cycles = 4 x 7.6

= 30.4 seconds

Second method :

This can also be calculated by using formula :

N = Amount of substance after decay

N0 = Original amount of the substance

t = Time required for decay

= decay constant

Half -life = 7.6 s

N = 1 g

N0 = 16 g

Insert the values in formula and then Calculate t

Electron configuration is the dissemination of electrons of an atom or molecule in molecular orbitals. Oxygen is composed of eight electrons in its atom, wherein there are two in 1s subshell; then two in 2s subshell; then four in 2p subshell. Its full ground electron configuration is: 1s^2 2s^2 2p^4