WebThe total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. Web12. Which of the following shows that an atom is stable.a. having 2 valence electron.B. having 4 valence electron C. having 6 valence electrons D. having 8 valence electrons 13. Which of the following will have the highest melting temperature?

Isotopes of rhenium - Wikipedia

WebSome 238 U atoms, however, could absorb two additional neutrons (for a total of 17), resulting in 255 Es, as well as in the 255 Fm isotope of another new element, fermium. The discovery of the new elements and the … WebThe neutron is composed of two down quarks, each with 1/3 elementary charge, and one up quark, with 2/3 elementary charge. The nucleus is bound together by the residual effect … fnk tech usb card reader

Rutherfordium - Element information, properties and uses

WebIsotopes of rhenium. Naturally occurring rhenium ( 75 Re) is 37.4% 185 Re, which is stable (although it is predicted to decay ), and 62.6% 187 Re, which is unstable but has a very long half-life (4.12×10 10 years). [4] Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lower abundance ... WebThe atomic number of rhenium is 75. That is, the number of electrons in rhenium is seventy-five. Therefore, a rhenium atom will have two electrons in the first shell, eight in the 2nd orbit, eighteen electrons in the 3rd shell, and thirty-two in the 4th shell. WebFor instance, neon which has the atomic number, 10 has the electron configuration 1s² 2s² 2[tex]p^{6}[/tex] . In addition, an orbital diagram is a visual representation of how electrons are arranged in an atom. Arrows in an orbital diagram represent the electrons of a specific atom or element. fnk tech usb card reader software