8.1 7) How many unpaired electrons are there in the Lewis structures of a [pic] ion? A) 0 B) 1 C) 2 D) 3 E) This cannot be predicted. Answer: A Diff: 1 Page Ref: Sec. 8.1 8) How many unpaired electrons are there in an [pic] ion? A) 0 B) 1 C) 2 D) 3 E) This cannot be predicted.
C) electron-volt. D) farad. Answer: B Diff: 1 Type: BI Var: 1 Page Ref: Sec. 17.1-17.3 3) Two identical aluminum objects are insulated from their surroundings. Object A has a net charge of excess electrons.
The simplest and most common element is Hydrogen, which can be in the form of a single proton, an extremely tiny particle with a positive charge. Sometimes electrons, even tinier particles, surround the proton, forming negatively charged shells. When two Hydrogen atoms link together, they form a Hydrogen molecule. Our sun, and all the other stars in the universe, are mostly made of the element Hydrogen. Trillions and Trillions of Hydrogen atoms are being smashed together in the sun and releasing energy which we feel as light and radiation.
Continuous spectrum: a spectrum that exhibits all the wavelengths of visible light 13. Line Spectrum: a spectrum showing only certain discrete wavelengths 14. Quantum model: The quantum mechanical model is based on quantum theory, which says matter also has properties associated with waves. According to quantum theory, it’s impossible to know the exact position and momentum of an electron at the same time 15. Ground state: the lowest possible energy state of an atom of molecule 16.
Unbalanced. Now, we cannot change the subscripts, but, we can add a number in front of an atom to multiply the number we already have. When an atom is in a group, such as hydrogen and oxygen on the left and iron and oxygen on the right, you cannot multiply one specific atom in the group. The whole group has to be multiplied. If the atom is alone, such as the iron on the left and the hydrogen on the right, you can just multiply that atom.
It is not enough to just answer the question, so here is a breakdown of how the energy is transferred from the core to the Earth and the other objects in our solar system. The Sun’s extends from the center to about 0.25 of the solar radius. It has a density of 150 g/cm3 and a temperature of close to 13,600,000 K. Energy is produced by nuclear fusion during a series of steps called the proton-proton(P-P) chain, converting hydrogen to helium. The core is the only part of the Sun that produces an appreciable amount of heat through fusion(99%). The rest of the star is heated by energy that is transferred outward from the core and the layers just outside.
It releases a huge amount of energy and all the neutrons released cause fission with the other surrounding nuclei of uranium-253, and this is what causes a chain reaction. After the fission process has started it has to continue the release of energy to create a big enough reaction. The results depend on how many neutrons actually collide with uranium-253, and how many pass to the surrounding area without colliding with the nuclei. There are three different things that could happen, in a subcritical process if there are only three uranium nuclei present and only one or two actually fission then the process soon dies out. The critical process requires that one neutron from each fission process produces only one more fission process.
Column 17 is made up of the more reactive gases- the halogens. The noble gases are in column 18. The electrons are the most significant part of an atom. When atoms don’t have the sufficient number of electrons they need in their outer level, they will do whatever they can to get the number they need. The number of protons an atom has is its atomic number.
The first quantum number is the principle quantum number which takes the states of n = 1, 2, 3, 4, ... . This quantum number reflects the Bohr radius of the orbit on which the electron moves and the total energy of the atom. The second quantum number is the angular quantum number l = 0, 1, 2, 3, 4, ...n - 1. The angular quantum number is related to the angular momentum of an electron when it's moving around a nucleus. The third quantum number is the magnetic quantum number with m = l, l - 1, l - 2, ..., -l+1, -l. There are n - 1 total nodes, l of which are angular nodes.
Light can be considered as packets of energy called photons. A photon is a particle of electromagnetic radiation. Einstein found a very simple relationship between the energy of a light wave (photon) and its frequency: Energy of light = h × f Energy of light = (h × c)/λ Where h is a universal constant of nature called ``Planck's constant'' = 6.63 × 10-34 J/sec. All atoms have electrons. When electrons get excited they can jump from a low energy level to a higher energy level, as the electron can’t remain there, the electron de-excites and moves back to the lower energy level.