How were the magic numbers figure out inside the nucleous of an atom?
372069
I wish I had your brain
1089354
Whatever its atomic number is, would be the number of electrons. If it's an ion, then add for every negative value and subtract for every positive one.
8585
Hi,\n\nMagnetic Quantum Number "m" in relation to Azimuthal Quantum Number "l" can be depicted by- \n\nm = 2l + 1\n\nSo, for any subshell (defined by the value of L), there are (2L + 1) values of M possible given by-\n\nM = -L, -(L-1), ......, 0, ....., (L-1), L\n\nSo, from your given options, I think the second one- -L, 0, L  is the closest.
737924
You can figure it out.\n\nIf a neutral atom of zinc has an atomic number of 30, and a mass number of 65, then it has 30 protons, 35 neutrons, and 30 electrons.\n\nProtons and neutrons are found in the nucleus.\nSo, draw a circle. Write "30p+" and "35 n" inside it.\nThis represents the nucleus.\n\nIn Bohr's model, electrons orbit the nucleus at specific energy levels. The first level holds up to 2 electrons.\nThe second holds up to 8.\nThe third holds up to 8.\nThe fourth holds up to 18.\nWe use dots to represent electrons.\n\nDraw a ring around the nucleus.\nAdd two dots to the ring, usually at noon and 6:00.\n\nDraw another ring around the first one.  Draw eight dots: two at noon, two at 3:00, two at 6:00, and two at 9:00.\n\nContinue adding rings and electrons.\nYou should end up with twelve dots in the outermost ring.\n\n(Which doesn't correspond with the  Lewis diagram for zinc, but that's  another story....)
910896
The answer comes from quantum mechanics and involves some graduate level math. \n\nThat being said the general rule is that a Principal quantum number can have up to 2n^2 electrons.
648583
Atom  \n\nThe smallest unit matter can be divided into whilst still retaining its chemical identity. Atoms are not single particles but complex arrangements of three types of particles. The subatomic particles, protons, neutrons and electrons, combine to form atoms. The protons and neutrons provide the bulk of an atom's mass and are concentrated into a tiny central region known as the atomic nucleus. The nucleus is held together by the strong nuclear force which acts between the constituent particles (termed nucleons ). The protons are positively charged and so mutually repel each other, but it is not until there are many of them that they overcome the nuclear force. Thus there is only one stable element beyond lead (Z=82). Whilst the radius of an atom is in the region of 10-10 metres, the atomic nucleus is about ten thousand times smaller at 10-14 metres. The volume surrounding the nucleus is where the electrons exist. They are much lighter than the protons and neutrons and carry a negative electrical charge. Being opposite in charge to the nucleus, the electrons are held in orbits around it by the force of electromagnetism. The electrons exist in electron orbitals around the nucleus. These orbitals are grouped into shells. Within each shell are energy levels which allow the electrons to exist in unique quantum states, depending upon their angular momentum (hence energy), in accordance with Pauli's exclusion principle . In a neutral atom the number of electrons equals the number of protons. When ionisation occurs, one or more electrons are provided with enough energy to escape the atom altogether. What remains is known as an ion because it is now positively charged and will behave in a different way chemically from neutral atom. The number of protons in the nucleus of an atom (the atomic number , Z) defines which chemical element it is. There are just over 110 known chemical elements and these can be arranged in a classification sequence known as the periodic table. The number of neutrons in any given atomic nucleus can also vary. The total number of protons + neutrons is termed the atomic mass number (A). Most atoms have a prefered number of neutrons at which their nuclei are stable. Atoms with more or less neutrons than the stable configuration are known as isotopes and will often undergo radioactive decay. The simplest of all atoms is hydrogen and is a special case which has a nucleus of one solitary proton and a single electron in orbit around it. It is the only nuclide (species of nucleus) with no neutron. A stable isotope of hydrogen is called deuterium which has one neutron in its nucleus; tritium is an unstable (radioactive) isotope of hydrogen and has two neutrons. See also atomic absorption , atomic emission , atomic number , molecule .
927180
Here are the rules as far as I know...\n\n1. The maximum capacity of each shell is given by 2n^2 (where n is the shell number starting from the innermost shell)\n2. The maximum capacity of the last shell, regardless of the atom, is 8.\n3. The maximum capacity of the penultimate shell (the second last shell) is not more than 18.
482427
The "atomic" number refers to the place in the periodic table which corresponds directly (is equal to) the number of protons. The mass number is a weighted average involving commonly found isotopes.
505737
there are 4 quantum numbers usualy written\n(n,l,ml,ms)\n\nn = principal quantum number, it denotes the energy level of the electron - which row on the periodic table\n\nl = angular momentum quantum number, it denotes the total angular momentum of the orbit the electron is in - which group of columns on the periodic table valid values of l go from 0 to n-1. usually denoted 0=s,1=p,2=d,3=f...\n\nml = magnetic angular momentum goes from -l to l\n\nms = spin of the electron either + or - 1/2\n\nno two electrons can have all 4 quantum numbers the same in an atom by pauli's exclusion principle.\n\nthese number all come from solving schoedinger's equation for the hydrogen atom, if you understand PDE, the derivation is really cool but hard.
974033
Atomic number always says how many protons.  Every element will always be defined by its unique number of protons.  Atomic number 5 will have 5 protons.  Electrons don't really weigh anything, so they don't count towards mass number.  So what's left? Neutrons.  So 10mass units-5for protons=5 neutrons (A)\n\nThe number of electrons in a neutral atom must cancel the charge of the protons.  Each proton is +1  and each electron is -1.  If I have 5 protons in the nucleus, I have +5.  A neutral atom should have 0 charge.  So 0=+5-(# of electrons) and you get 5 electrons (A)
287953
actually, it's arranged by the number of protons in the nucleus of an atom of each element, though the list in this song: http://www.privatehand.com/flash/elements.html\nis not.
778176
Use the periodic table of the elements.  The "weights" are in grams per mol.  Just use algebra and solve for the number of mols.  Then you know how many atoms there are by the number of mols which is a definite number.
968601
this is what you do to find how many neurons and element has k What you do is Like if you look at tthe periodic table like the element Uranium and subtract the atomic mass from the atomic # and thats how you find out how many nuerons there are in an element and to find the electrons what you do is if you see a # on the right side of the element if it has  a # by it with a +/ -you do the oppisite of the sign taht is by the # like in Uranium since the atomic # is 92 subtract the # that is right next to the Symbol if it is a + and if it is a - then you would add it
773257
Re:  For Helium, the "2" is called the atomic number and it means that Helium has 2, protons, 2 nuetrons and 2 electrons.\n\nFor Lawrencium (Lr) it should show 103 as its atomic number.  That means that Lr has 103 protons, 103 neutrons and 103 electrons.  \n\nThe 2, 8, 18, 32, 32, 8, 3 numbers are showing electrons per shell (different subject) but you'll see that if you added all the numbers 2+ 8+ 18+ 32+ 32+ 8+ 3 = 103.  103 is the total number of electrons Lr has.   \n\n____________________________________________\n\n\n\n\nFor a Normal Neutral Atom, the number of protons (p+), neutrons (n) and electrons (e-) are all the same. \n\nJust look up the atomic number from the periodic table to determine them.\n\nFor example:\n\nC: 6p, 6n, and 6e-.\nN: 7p, 7n, and 7e-.\nK: 19p, 19n, and 19e-.\n\nNow, Determine the number of p, n, and e- for Ca.\n\n\n\n\n\n\nIf you guessed, 20p, 20n, and 20e-, you are Correct!\n\n\nNote that, if you add the number of the atom's p and n you will get the Mass number (Z). \n\nThe periodic table shows Z of calcium as 40.078 because 20p + 20n = 40 (amu) \n\nAnother Example: Oxygen, having atomic number of 8, will have:\n8p, 8n, and 8e-. This means that Oxygen will have the mass number of 16 because; p + n = Mass number (Z).\n\n______________________________...\n\nFor Isotopes:\nIsotopes are atoms that have same number of protons but different number of neutrons.\n\nYou've already seen that normal Carbon has: 6p, 6n, and 6e-.\n\nThis normal carbon is called "Carbon-12". The "12" denotes its Mass number (Z). Which is p + n.\n\nThere are isotopes of Carbons and one of them are Carbon-13. Since you already know that Carbon must have 6p, Carbon-13 has 7n. 13 - 6 = 7. The number of the electrons are still the same as number of proton. \n\nIn another words, simply subtract the number of protons from mass number to determine the number of neutrons.\n\nNow, determine the number of p, n and e- of Fluorine-19:\n\n\n\n\n\nIf you guessed 9p, 10n, and 9e-, you are Correct!\n\n______________________________...\n\nFinally, there are ions. Ions means that an atom has either gained or lost electrons. Keep in mind that eletrons are NEGATIVE in nature (e-) and when an atom Gains e-, it becomes More negative.\n\nFor example: Fluoride ion, F- means that it has GAINED one electron compared to its neutral F state. Therefore;\n\nF has 9p, 9n, and 9e-, But F- has 9p, 9n, and TEN e-.\n\nO has 8p, 8n, and 8e-, But O2- has 8p, 8n and TEN e-, because O2- means that it has Gained 2 more electrons than its normal O state. \n\nNow, determine the p, n and e- for P3-.\n\n\n\n\n\nIf you guessed 15p, 15n, and 18e- you are Correct!\n\nFor atoms that have positive charges (cation), remember that they LOSE e- to become positive. So, Li+ has 3p, 3n and 2e-. \n______________________________...\n\nKeep in mind that you need to know how to combine all three of the ideas mentioned above. For example, you may be requested to determine the p, n and e- of Magnesium-25 ion. \nYou need to know that since Magnesium is in Group IIA, it will turn into 2+ ion. Therefore Magnesium-25 ion will have 12p, 13n, and 10e-. \n\nI hope this answers your question. Good luck!
1159688
The density, the atomic structure, and the state of matter it is in.
736123
atomic mass - atomic number(# of protons) = # of neutrons
460952
Two hundred quattuordecillions\n\nCan be written using scientific notation as 2.0 x 10^47