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There are many subatomic particles with negative charge, but the first negatively charged particle that anyone learns about is the electron. It is only invisible in the sense that humans can not see it because it is so small. It is a perfectly normal subatomic particle and certainly the most common negatively charged particle in the universe.
Since, the proton cannot be taken out of the nucleus these changes occur due to addition or removal of electrons.
The periodic table would be disturbed only if isotopes of a new element are discovered, because a periodic table is based on order of atomic number, not atomic mass. If new isotopes of a previously known element were discovered, the atomic mass shown in the periodic table might be changed, but this is very unlikely because the atomic masses shown in a periodic table are based on the naturally occurring distribution of isotopes, and any newly discovered isotopes would probably occur only in very small fractions of the total.
he changed it
An atom A fundamental particle
There are many subatomic particles with negative charge, but the first negatively charged particle that anyone learns about is the electron. It is only invisible in the sense that humans can not see it because it is so small. It is a perfectly normal subatomic particle and certainly the most common negatively charged particle in the universe.
New elements have been discovered or synthesized and added to the Periodic Table.
Since, the proton cannot be taken out of the nucleus these changes occur due to addition or removal of electrons.
No, from 80 years.
The periodic table would be disturbed only if isotopes of a new element are discovered, because a periodic table is based on order of atomic number, not atomic mass. If new isotopes of a previously known element were discovered, the atomic mass shown in the periodic table might be changed, but this is very unlikely because the atomic masses shown in a periodic table are based on the naturally occurring distribution of isotopes, and any newly discovered isotopes would probably occur only in very small fractions of the total.
the electron
he changed it
Additional elements have been discovered and added including the synthetic elements. Some of the previously "synthetic" elements have been discovered to be naturally occurring, and have been changed to reflect this. The Atomic Mass calculations have been improved.
Yes and no. Technically speaking the charge of a subatomic particle such as an electron or proton is always the same, this is why they are called constants. However, the methods that have been employed to determine the actual value of the elementary charge may not be the correct value. This would be due to experimental error, etc.
Yes. The periodic table has not been the same over the last 75 years, as many more elements have been discovered since then. My grandfather has a mouse mat with a periodic table from 20 years ago, and it is now out of date.
periodic rate
The number of electrons is changed.