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Yes
The value of the ionization energy of dubnium is not known today.
Energy Band gap value for calcium carbonate and barium carbonate?
ionization energy
The official (SI) unit for energy is the joule.
In original Bohr model, two electrons are moving on the opposite sides of the nucleus. But this model is not consistent with the experimental value of the ground state energy. Please see the link "Bohr model helium" below. This model is just consistent with the experimental value.
Yes
Not if they are consistent.
Velocity = distance / time
Standard value is the general agreed upon value that always remains constant. It is used so figures will be consistent across the board.
all of the above
Relative value is a dimensionless quantity, and so it shouldn't matter what units you want to use, as long as you are consistent.
No. However, you can (and will) convert high-value energy to low-value energy. In other words, energy gets "used up" in the sense that it gets converted into a form that is no longer useful.
yes
The Potential energy decreases as r increases.
Principal energy levels are an atom's major energy levels, ranging in value from 1 to 7. Energy sublevels are contained within principal energy levels, and their number increases as the value of the principal energy level increases.
A value system is a set of consistent ethical values (more specifically the personal and cultural values) and measures used for the purpose of ethical or ideological integrity. A well defined value system is a moral code.