The valence electrons are either lost to another atom or the sodium atom gains valence electrons, it really depends on if what the sodium atom is bonding with has a lot or a little of valence electrons. The structure doesn't change though, just the number of valence electrons change.
The nucleus is never changed when an ion is formed.
structure
It becomes harder to change the water's pH. The water becomes more likely to start growing algae.
slow and reversible
A tornado that moves onto water becomes a waterspout.
P+ -e= -P
how will the electron configuration of the atom change when the atom becomes an iron
physical change
a change of state
The moonsoon occurs when there is change in the direction of the wind.
No one really cares
The logs cellular structure becomes burnt.
Usually such an experiment is carried out to find the change in enthalpy of the reaction.
A chemical change.
Potassium can lose one electron from its outer shell to achieve a stable electron configuration similar to argon. Fluorine can gain one electron to fill its outer shell and attain a stable electron configuration like neon. In both cases, the atoms are trying to achieve a full valence shell and become stable like the nearest noble gas.
When ice melts and becomes a liquid it is a physical change. When the liquid boils and becomes gaseous it is a physical change. It is a chemical change when the molecular structure has been changed in some way, here it has not.
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It is a physical change and only becomes a chemical change if the sugar is burnt.