what is the 112th elemt of a periodic table?
955310
Although I don't understand why you wouldn't just search for the answer, it is ununbium, which is the temporary IUPAC name for an element synthesized for a brief time (<< 1s) in around 2002 and 2004. It is not naturally occuring and little is known about it.
573382
Magnesium is the 12th element (atomic number 12).\n\nCarbon is the 6th element, but has an atomic mass of 12.
767025
The atomic number of Helium is Two and its mass number is 4.\nPROTONS:2\nNEUTRONS:2\nELECTRONS:2\n\nThe atomic number of Gold is 79 and its mass number is 197.\nPROTONS:79\nNEUTRONS:118\nELECTRONS:79
960169
Indeed, the number of neutrons in Bromine (79.904 amu) is 45.\n\nThe AMU is given as a decimal because it is the average AMU of a mole of Bromine atoms(a really lot of atoms). On the Periodic Table round the given AMU and you will have the most commonly occurring isotope (atoms of the same elements with different numbers of neutrons).\n\nGet an "A".
697931
Check the Periodic Chart and find element 74.  That's the symbol to use, and its ion will be +6
381120
look it up on any periodic table - like the one linked below... good luck!
597810
To be a homogenous a mixture must be the same throughout.  If you are only having 29 protons in the nucleus, then it is only one element.  Element number 29 is copper.  Try some nice copper wire.  Common and chemical names are both "copper".
336969
You answered your own question. They're arranged in order of weight. Okay, they're not in perfect order, but nearly every periodic table lists the ordinal (1,2,3,4...etc) atomic weight right on it.
172336
I believe the answer is Osmium. He is asking for number of neutrons, not number of protons. Take the atomic mass, (Os = 190.23) And subtract the number of protons it has (Os = 76), giving you an answer of 114.
714340
look up the periodic table...duh
778586
It's in the 6th row, so n= 6.\nIt's in the first column of the "p" block of the table, so it's highest energy electron is 6p1\n\nStarting from Xe, and following the atomic numbers, these are the orbitals that are filled :\n\n[Xe] 6s2 4f14 5d10 6p1\n\nThe valence electrons are the ones with the highest quantum numbers: 6s2 6p1.
1157452
The first 92 elements of the periodic table occur naturally (from hydrogen to uranium).\n\nBTW, in reference to earlier poster, some of the naturally occurring elements (radon, radium, uranium, others) are radioactive, as well.
948794
protons is the atomic number\nvalence electrons corresponds to this:\nGroup 1 (I) (alkali metals) :1\nGroup 2 (II) (alkaline earth metals) :2\nGroups 3-12 (transition metals) :1 or 2\nGroup 13 (III) (boron group) :3\nGroup 14 (IV) (carbon group) :4\nGroup 15 (V) (nitrogen group) :5\nGroup 17 (VII) (halogens) :7\nGroup 18 (VIII or 0) (noble gases) :8\n\n\nEvery element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. It goes down the periodic table like that. At this time, the maximum number of electron orbitals or electron shells for any element is seven.
864891
The isotopic notation is just the mass number (proton + neutron) before the chemical symbol. Since copper has an atomic number of 29 then the isotopic notation respectively, \n63Cu\n\n65Cu
432254
* Name: copper\n    * Symbol: Cu\n    * Atomic number: 29\n    * Atomic weight: 63.546 (3) r\n    * CAS Registry ID: 7440-50-8\n      \n      Standard state: solid at 298 K\n      Colour: copper, metallic\n      Classification: Metallic\n\n    * Group number: 11\n    * Group name: Coinage metal\n    * Period number: 4\n    * Block: d-block
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S\n  * Group in periodic table: 16\n    * Group name: Chalcogen\n    * Period in periodic table: 3\n    * Block in periodic table: p-block\nFind the rest here --> http://www.webelements.com/webelements/scholar/
896371
It is now called Roentgenium 111. Look it up in any search engine.