Answer:
Energy levels : It refers to the shells of definite energy in which electron revolves around the nucleus .
Explanation:
As we know, that atom consist of small dense mass that is nucleus and around it the shells of definite energy are present .
We also know ,atom consist of sub atomic particles that is :
- In shells the electrons are present and are not stationary (they are revolving ).
- The electron never absorbs or releases energy by itself .The electron in shells have definite energy that is the reason the shells are referred as energy levels .
- But, when we supply energy to electron which is more than the energy of the shell then it gets excited to higher energy level (depending upon magnitude of energy supplied ).
- The higher energy level is regarded as excited state .
- The excited states are always unstable .
- So, electron revolves there for short span of time but ultimately it returns to its own shell and by doing so it release the energy absorbed by it .
- The energy released is actually a difference in the energy of ground state (original state ) and energy of excited state .
- ΔE=E₂-E₁
The correct answer for the question that is being presented above is this one: "C) The reaction is spontaneous at high temperatures."
Since dH is positive and dS ~ 0 then -TdS ~ 0, meaning dG will always be greater than 0 so t<span>he reaction is spontaneous at high temperatures.</span>
Answer:
Evaporation
Explanation:
Evaporation is the certain process that requires water to gain heat energy from the environment.
Answer:
D
Explanation:
because the rest don’t make any sense
A period in the periodic table is a horizontal row. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.