How many electrons are in the 4th orbit around the nucleus?
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initially,the 4th orbit occupies 8 e-'s, & next orbit is filled but at times when higher levelorbit(5)get's filled (4th)it takes up 18(total)e-'s\nfurther refer text...for quantum mechanics filling is done in reff.to AUFBAU RULE.
199003
a proton has a weight of approximately 1836.15 electrons
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boron has five protons and electrons
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According to quantum mechinics, an electron is not confined to an orbit as we know for satellites, it has a 'shell' of probability where it is most likely to be found. It also has the small but finite chance of being found inside the nucleus of the atom, so the anwer is 0.
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First off, the electrons aren't located in the nucleus, only protons and neutrons.  The electrons orbit the nucleus.\n\nThe electrons in the outer shell of an atom determine it's chemical and physical properties because they determine what other elements or ions they can react with.  The relative availability of electrons in one element enables it to donate some to another element that requires them to have a full outer shell (sometimes known as the octet rule, since the first few rows on the periodic table all require eight electrons in the outer shell to be stable)  The larger the element, the more electrons (and protons and neutrons), and this gets into electrostatic attraction and repulsion in addition to electron affinity.  Electrons are also involved in crystal structure of metals and alloys, and again, how they allow crystal cells to form determines how hard or ductile a crystalline structure can be, how conductive it is to heat or electrical current, etc.\n\nOf course, the number of electrons orbiting the nucleus of an atom is only one factor affecting the physical and chemical properties.  The stability of the nucleus is another factor, which has to do with the number of protons and neutrons present as well.
40150
The atomic # of the element is the # of protons and (some times electrons) in the element
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a.  Expanded shell/with 6 pairs of electrons around the central molecule.\n\nb.  Expanded octet with four shared pairs and one unshared pair.\n\nc.  Not sure but free radical with one double bond between an oxygen and and Cl.
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the nucleus and the electron cloud      the nucleus is the tight bundle of protons and neutrons in the center of the atom and the electron cloud is the space where the electrons circle around the nucleus
814740
Look at the proton number, which is 23. That means the electron arrangement ends in 3d3 4s2.  Hund's Rule suggests that the 3d3 electrons go in separate orbitals before being forced to pair up, so a V atom has 3 unpaired electrons.
828892
18 electrons, two electrons in each one of the 9 orbitals with principal quantum number n = 9.
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Answer:  SIX electrons\n\nI drew a diagram for you: http://server6.theimagehosting.com/image.php?img=untitled.34c.JPG\n\nElectron Configuration of Fe: 1s2 2s2 2p6 3s2 3p6 4s2 3d6 \n\nExplanation:  As you can see in the electron configuration above, there are 6 electrons in 3d orbitals of Fe in its ground state.
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a nucleus, containing protons and neutrons  and around that nucleus, there are electrons. [Although it more correct to speak of electron clouds, as they are not really localized. ]
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It describes electron location in terms of probabilities.  The energy levels around a nucleus are not well-defined orbitals.  Rather, they are regions of space where an electron may be found.  Withing the orbitals, the electron's precise location can not be known.  According to Heisenberg's Uncertainty Principle, the more accurately we measure an electron's location, the more imprecise the measurement of its velocity becomes, and vice-versa.\n\nSo, the best description of an electron's location is that of an "electron cloud", which represents the region in space where an electron has the highest probability of being.
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211_____207_____4\n      Bi  -->__Tl +____a    (a helium nucleus) \n83_______81_____2
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The three subatomic particles are the proton, the neutron and the electron. \n\nThe proton is positively charged, the neutron is neutral. The neutron is one tenth of a percent heavier then the proton. 17 protons and 18 neutrons form the nucleus of the chlorine atom, held together by the strong nuclear force.\n\nIn nature we also find chlorine atoms with 2 more neutrons. One out of four actually. Atoms with the same number of protons, but a different number of neutrons are called isotopes.\n\nElectrons run in orbits around the nucleus. They are negatively charged. Chlorine has 17 electrons, which together with the protons accounts for a neutral atom.\n\nHowever, the electrons tend to group in shells. The lowest shell has room for two electrons. The next two shells can harbour 8 each. But chlorine has 17 electrons. 17=2+8+7 and therefore the outer shell misses one to be completely full.\n\nChlorine therefore prefers to make compounds where it can catch an extra electron. Take for instance common salt a coumpound of sodium Na and chlorine Cl. The sodium atom gives up an electron and becomes Na+. The Cl atom becomes Cl-, filling the outer electron shell. The two ions combine and we have an NaCl molecule.\n\nNow you know, Jess!
802906
they fill the s orbitals with 2 electrons
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Violet12.. is right on both questions. Now, about the second question:\n\nFor the 4s orbital: n + l = 4 + 0 = 4.\nFor the 3d orbital: n + l = 3 + 2 = 5\n\n4 < 5, so the 4s orbital has less energy than 3d, so we put electrons first in 4s orbital and then in 3d.