stars life. High mass star’s ultimate fate is to succumb to the pressure from gravity and end its life. The star releases all of its energy in an explosion called a supernova‚ leaving behind a star of all of the neutrons left packed tightly together in what is called a neutron star. The neutron star will either become too dense collapse
Premium Star Hydrogen White dwarf
Plutonium Essay I would like to work on the metal plutonium because the discovery of plutonium has a great impact on the world. Plutonium’s symbol is Pu and its atomic number is 94. This element has 150 neutrons and 94 protons and its standard atomic weigh is 244. Plutonium is located in the 7th period and it is a silvery white metal. One of its main uses is to act as the fuel of nuclear fission Plutonium does not exist naturally‚ although some say that small
Premium Nuclear fission Nuclear weapon Uranium
atoms of Li‚ Na‚ K‚ and Rb‚ respectively? 6. ____ What is the total number of neutrons in an atom of (1) 26 (2) 31 (3) 57 57 Fe? 26 (4) 83 7. ____ Compared to an electron in the first electron shell of an atom‚ an electron in the third shell of the same atom has (1) less mass (2) less energy (3) more mass (4) more energy 8. ____ An atom in the ground state contains a total of 5 electrons‚ 5 protons‚ and 5 neutrons. Which Lewis electron-dot diagram represents this atom? 9. Determine the
Premium Atom
the element carbon has three naturally occurring isotopes. The most common of the three is carbon-12 is accountable for 99% of of the carbon that is found in nature. Carbon-12 has 6 neutrons. Another isotope of carbon‚ carbon-13‚ has 7 neutrons. The least common isotope of carbon‚ which is carbon-14‚ has 8 neutrons. All three isotopes of carbon have 6 protons‚ which makes them a carbon atom. Explain radioactive isotopes and one medical application that uses them. A radioactive isotope is an unstable
Premium
protons‚ electrons‚ and neutrons. b. The subatomic particles are found in either the electron cloud‚ or the nucleus. The electrons are found in the electron cloud‚ which circles the atom‚ and the protons and neutrons are found in the tiny nucleus of the atom. 2) How does the Atomic Mass # differ from the Atomic #? The atomic mass differs from the atomic number by the fact that the atomic mass is composed of the total number of protons and neutrons in the nucleus‚ and the
Free Atom Electron
sufficiently high number of nuclear mass) are bombarded with neutrons. Ordinarily neutrons move too quickly to split nuclei when they collide with them‚ but if neutrons are slowed down they can break apart nuclei. Each collision splits uranium atoms into smaller atoms and releases two or three neutrons‚ along with energy and radiation. Because the uranium nuclei is surrounded by innumerous number of other similar nuclei; the extra neutrons; besides the releasing of the energy of the previous nuclei
Premium Nuclear power Nuclear fission
occurring uranium comprises‚ almost entirely‚ two isotopes: U238 (99.283%) and U235 (0.711%). The former is not fissionable while the latter can be fissioned by thermal (i.e. slow) neutrons. As the neutrons emitted in a fission reaction are fast‚ reactors using U235 as fuel must have a means of slowing down these neutrons before they escape from the fuel. This function is performed by what is called a moderator‚ which‚ in the case of certain reactors (see table of Reactor Types below) simultaneously
Premium Nuclear fission Nuclear power Electricity generation
atomic number? (2.02) 11. What does the atomic mass tell us about an atom? (2.02) 12. How many protons‚ neutrons and electrons are in an atom of Carbon? Explain how you determined them. (2.02) 13. How can an atom be electrically neutral? (2.02) 14. The atomic number of silver (Ag) is 47. A silver isotope has a mass of 108. How many electrons‚ neutrons and protons are in an atom of silver? Explain how you determined these. (2.02) 15. Define isotopes. Compare and
Premium Atom
composed of a nucleus made of protons and neutrons (hydrogen-1 has no neutrons). The nucleus is in turn surrounded by a cloud of electrons. The electrons in an atom are bound to the atom by the electromagnetic force‚ and the protons and neutrons in the nucleus are bound to each other by the nuclear force. Over 99% of the atom’s mass is in the nucleus. The protons have a positive electric charge‚ the electrons have a negative electric charge‚ and the neutrons have no electric charge. Normally‚ an atom’s
Premium Atom Proton
Chapter 3 Atoms and Elements 1 3.1 Elements and Symbols Chemistry: An Introduction to General‚ Organic‚ and Biological Chemistry‚ Eleventh Edition Copyright © 2012 by Pearson Education‚ Inc. Elements 2 Elements are • pure substances that cannot be separated into simpler substances by ordinary laboratory processes • the building blocks of matter • listed on the inside front cover of this text Chemistry: An Introduction to General‚ Organic‚ and Biological Chemistry‚ Eleventh Edition Copyright
Free Atom Periodic table