I think that the answer could be A. X and Y
Answer:
The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. ... The value of the radius may depend on the atom's state and context.
Explanation:
Weaken London dispersion forces and stronger dipole dipole forces
Answer:
J.J. Thomson was the name of scientist
He used Cathode ray tube experiment
He named that particle as Electron.
Explanation:
no explanation required.
The speed of sound at 20 oC in air is 343 m/s.
The speed of sound in helium at 20 oC is 927 m/s.
The speed of sound in natural gas (methane) at 20 oC is 446 m/s.
Explanation:
- The speed of sound depends upon the density and elasticity of gas.
- The speed of sound is the distance which is traveled per unit time by a sound wave as it goes through an elastic medium.
- The speed of sound in gas depends only on its temperature and composition.
- Also the speed of sound refers to the speed of sound waves in air.
- Air IS 343 m/s
- Helium is 927 m/s.
- Natural gas (methane) is 446 m/s.
