Friction is helpful:
- We use it to brake for cars
- We use it to fly planes
-We wouldn't be able to turn a door knob without friction ( Our hand would just slide off it)
Friction harmful:
-Our cars would get much better gas mileage without tire and air friction
- There would be no skinned knees if friction didn't exist (Like when your skating or football)
- We could do some pretty cool dance moves without friction
- Our shoes would last longer without friction
Answer:
The most stable resonance structure shown in fig (II).
Explanation:
Given that,
If oxygen is the central atom in the CON– ion
We know that,
Resonance :
The movement of electron is called resonance.
If the electronegativity is more of element then the element is more stable.
We need to find the most stable resonance structure
According to figure,
Electronegativity of N is more than C
So, N is the more stable in fig (II).
Hence, The most stable resonance structure shown in fig (II).
Radium is by far the more reactive non metal. It is in a group of elements that are extremely radioactive and unstable.