How many atoms are in a Hydrogen element?
597167
2 - hydrogen exists in nature as a binary element
640543
When the number of atoms of each element are equal on both sides.
590815
"Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom."\n\nSource: http://en.wikipedia.org/wiki/Water\n\nWater is just another combination of basic elements, why they formed, and in the quantities they did is open to speculation.
693223
Yes an atom is the same as an element.  A single atom is the smallest particle of an element.  There are 118 different elements in the periodic table. For example, a Hydrogen atom is one proton and one electron.  The next element in the periodic table is Helium, it has one proton, one neutron and one electron.  Each of these atom examples represent their own element.  So you see a single atom does represent it's own particular element, as discussed in the Hydrogen and Helium examples.
232753
An atom is the smallest divisible partical that can exist on its own. Its divisibble because it contains three subatomical particals known as protons, neurons, and electrons while an element is a substance that cannot be split into two or more substance like the periodic table has a list of different elements, so examples of elements are those on the periodic table and atoms make up matter.
40150
The atomic # of the element is the # of protons and (some times electrons) in the element
1072568
The process is called stoichiometry and involves determing the number either from the reactants and products in an equation, or by using the electron dot configruation to determine the valence electrons and oxidation number.  Short version, you need to know how many outer shell electrons are in each of the elements in the compound, not just the one you are looking for.  \nEXAMPLE: H20, hydrogen has one outer electron, oxygen has 6.  The stable number is 8, so two atoms of hydorgen are needed to satisfy the stable configuration of oxygen.
783251
The number after an element is the number of atoms of that element.\n\nStart with NH4\nNH4 has:\n1 nitrogen\n4 hydrogen\n-----\nTotal of 5\n\nBecause it is in parentheses, that means there are multiple molecules of NH4... specifically 2 of them.\nThus (NH4)2 has 10 atoms (5 x 2).\n\nThen you have:\nCr2 --> 2 atoms of cromium\nO7 --> 7 atoms of oxygen\n\nAltogether you have 10 + 2 + 7 = 19 atoms in a molecule of (NH4)2Cr2O7
791445
It's composed of the most common isotope of carbon and hydrogen which is carbon-12 and hydrogen-1.\n\nCarbon-12 has 6 protons, 6 neutrons and 6 electrons.\n\nHydrogen-1 has 1 proton and 1 neutron.\n\nSo...\n\nProtons: (6 + 1) * 6 = 42\nNeutrons 6 * 6 = 36\nElectrons (6 + 1) * 6 = 42
809082
Water is a combination of 2 hydrogen atoms and 1 oxygen atom: H2O.\nnot H2O2!!!!!
106971
13. And I believe you mean 13 electrons. 13 protons, 22 neutrons, and 13 electrons. The atomic number is the number of protons in the nucleus.
883737
Hydrogen gas molecules, H2
714831
the atomic number is 5 b/c atomic number equals the number of elctrons and protons. You have 5 electrons so it should be 5.
857111
Nope not really\nactually\nit is 12\n8 atoms of hydrogen 4x2=8 and 4 atoms of oxygen 4x1=4\n8+4=12\nGood try though.
24017
With modern chemistry and quantum physics knowledge, we know 104 elements. \n\nAn element is defined by proton count, which in turn determines the number of electrons in orbit. Hence we know we aren't missing any elements in between, all numbers between 1 and 104 are known.\n\nThis leaves elements with proton counts of 105 or greater. The greatest difficulty in identifying these is that they are extremely unstable. The observer needs to be lucky and skilled to observe one of these superheavy elements before it decays.\n\nEven more so since these elements are produced by colliding heavy ions at high speed, creating lots of  energy at the collision. Capturing such an element and identifying its mass charge ration in a mass spectrometer or getting spectroscopical data that can be fitted to the theoretical energies one would expect is hard under these circumstances.
936423
Standard hydrogen has one proton and one electron. Standard helium has two protons, two electrons and two neutrons (so it's about four times as massive as hydrogen). Also, hydrogen has one positive chemical link, while helium has no chemical links (it's a noble gas, and therefore very inert).
978040
Or . . . 6.023 X 10 to the 23rd atoms.\n\nGet an "A".