Atomic excitation and electron excitation
I have one small confusion, when electron in an atom gets excited we say an atom gets excited right?
so when you say an atom is excited, is it that only ONE electron is excited in it, or more than one electron can get excited?
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More than one electron can be excited and sent to a higher energy orbital, or even be ripped off the atom altogether. Calcium atoms in normal cell conditions, for instance, are ionized to 2+, meaning that they have two more protons than electrons. This ionization is an extreme case of atom excitation.
Yeah, you're right
When electron jumps to higher energy level, we can either say the electron is excited or the atom is excited. Implies same thing.
regarding second question, when at atom is excited 1 or more electrons are excited. There is no specific no. of electrons
in the end it is the electron/s which jumps orbital. the no of electrons depend on the energy provided.
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"Atomic excitement" is ambiguous, as there are two general types of atomic excitement ... electronic and thermal(kinetic) and they can be independent of eachother. I say general, because there are many states of electronic excitement and many modes of kinetic excitement and they can all exist independently or all together e.g. an atom at absolute zero (at rest) can be ionized.
As a rule, we say a system is excited if any component of it is. So if an electron in an atom is excited, so is the atom, so is any molecule in which the atom happens to be embedded, and so is any device made from a material that contains the molecule.
It's not different from the fact that if you are part of a family, and you are happier, your family is also happier, and perhaps even your nation might be considered happier. Or if you are richer, so is your family, and so on.