The number of protons in an atom of any given element is always the same. Physicists call this the atomic number. So, in the above example of lead, its atomic number is 82 and that does not change; if it did, it would be a different element (thallium, atomic number 81, or bismuth...
The number of protons in an atom equals the number of electrons. This is necessary to balance the charge of an atom, and to increase its stability... See full answer below.Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our exp...
atomic mass. For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater. Such anomalies are due to the relative abundance of the "isotopes" or varieties of each element. All the isotopes of a given element have the same number of proton...
in their number of neutrons, and hence in their atomic mass.The isotopes of a given element have the same chemical properties but slightly different physical properties.We now know that atomic number (the number of protons in the nucleus), not atomic mass number (the number of protons and ...
If we label the number of protons in a nucleus byZand the number of neutrons byNwe say that the total number of nucleonsAis: A=Z+N The binding energy per nucleon versus mass number A. This figure shows that iron is the most stable nucleus and that helium is much more stable than oth...
All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass. The isotopes of a given element have the same chemical properties but slightly different physical properties. We now know that atomic number (the ...
Because their charges are equal, and because the other co-inhabitant of the atomic nucleus, the neutron, is neutral, then so long as the number of protons and electrons are equal then their charges cancel out and atoms are electrically neutral. Remove an electron from around an atom, ...
Every element has a unique atomic number. This is the number of protons in the nucleus of each atom. What is the atomic number of this helium atom? A neutral atom must have equal numbers of protons and electrons, so the atomic number of an element also gives the number of electrons. ...
Define Helium atom. Helium atom synonyms, Helium atom pronunciation, Helium atom translation, English dictionary definition of Helium atom. n. Symbol He A colorless, odorless inert gaseous element occurring in natural gas and with radioactive ores. It is
Many maxima in the excitation cross sections are found at energies of about 15 keV for singlet and triplet excitation of helium. A tentative explanation is given in terms of formation of intermediate molecular states. Excitation of the 4 1D level by protons results into two maxima, one at 15...