Answer:
Valence of iron in FeS2
Let the valency of iron be x
x+2(oxidation number of Sulphur)=0 as their is no charge on FeS2
As sulphur belongs to Group VI (chalcogens) so the valency/oxidation number of Sulphur is -2
x+2(-2)=0
x-4=0
x=4
So the valency/oxidation number of iron in FeS2 is +4
Explanation:
Hope it will help you monkey ^_^ it's crab
Solution :
According to the Graham's law of diffusion, we know that, the rate of the diffusion varies inversely to the molar mass of the gas, i.e.
Rate of diffusion, 
where, the 'M' is the molar mass of the gas.
Now in the case of the isotopes of the Krypton,
Atomic mass of
= 80 AMU
Atomic mass of
= 82 AMU
Atomic mass of
= 83 AMU
So the ratio of the rate of diffusion of the three isotopes are :



Dividing the above three with the smallest number among the three i.e. 0.10976, we get the relative rates of diffusion.
∴ 
= 1.02 : 1.01 : 1
Hence the relative rate of diffusion are :

Because it is less is equal dense to the water or liqiud density
Answer:
A
Explanation:
The mallet transfers kinetic energy, then that energy is transferred to the orange ball, then the purple ball, thus making the purple ball move
Answer:
Nickel is the answer
Explanation:
Lol that's easy the atomic number is the same number as the number of electrons.