D. Should be correct- the other ones don’t make sense
Minerals naturally occur.
<span>If all chemical reactions that release free energy tend to occur spontaneously,why haven't all such reactions already occurred? One reason is that most reactions require an input of energy to get started.Before it is possible to form new chemical bonds,even bonds that contain less energy,it is first necessary to break the existing bonds,and that takes energy.The extra energy required to destabilize existing chemical bonds and initiate a chemical reaction is called activation energy.</span>
Answer:
d. at ground state
Explanation:
Electrons in the Bohr's model of the atom are at the lowest possible energy state when they are their ground state.
The lowest energy state available to an electron is the ground state.
- According to the the Bohr's model of the atom, the extranuclear part is made up of electrons in specific spherical orbits around the nucleus.
- In the excited state, the level is higher than the ground state.
- When electrons changes state they either absorb or gain energy.
