百度试题 结果1 题目5 How many neutrons are present in the atom X? B A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
How do you calculate the half-life of uranium 235? What is the change in atomic mass number when an atom emits an alpha particle? How does stable isotope analysis work? A particular nucleus of the element plutonium contains 94 protons and 150 neutrons. What is the magnitude of the ...
It's not that simple though. An atom's properties can change considerably based on how many of each particle it has. If you change the number of protons, you wind up with a different element altogether. If you alter the number of neutrons in an atom, you wind up with an isotope. For...
Using Bohr's model of the atom, calculate the energy required to move an electron from a ground state of n = 2 to an excited state of n = 3. Express your answer in both J/photon and kJ/mol. 11. Derive the Bohr model of...
Calculating the ionization energy of an atom constitutes a part of modern physics that underlies many modern technologies. An atom consists of a central nucleus that contains positively charged protons and a number of neutrons specific to the given atom. A number of negatively charged electrons orbit...
Each element on the periodic table has an atomic mass -- an approximation of the mass of a single atom of that element. Because atoms are so small, a specific unit is used to measure the mass of small quantities of atoms. Very large quantities of atoms a
How can you calculate the number of neutrons (n) in an atom? What is the mass number of the isotope lithium-7? How do you find the mass and fractional abundance of an isotope? Bromine has two naturally occurring isotopes (Br-79 and Br-81) and an atomic mass of 79.904 amu. a. If...
Physicists came up with the idea of strange matter in the 1970s when they wondered what would happen if protons and neutrons were squished superhumanly hard [source: Freedman]. Let's repeat a similar version of their theoretical experiment, imagining we have an iron atom, plus a ...
One possible fission reaction for when a 235-U atom is hit by one neutron is the formation of 144-Ce and 90-Sr. How many neutrons and alpha particles are produced in this fission process? Calculate the energy released when 0.5g of uranium 235 undergoes fission reaction. ...
How does alpha decay release protons and neutrons? What nuclear decay emission consists of energy only? What is half-life in terms of radioactive decay? How do you calculate the energy released when tritium decays by beta emission? How much energy is necessary for beta decay of U-235?