How many atoms does uranium-238 have? How many valence electrons does an oxygen atom have? How many neutrons does oxygen have? How many atoms or molecules are there in a mole of a substance? How many electrons are in O2-? How many valence electrons does oxygen have?
How many atoms of oxygen are in one formula unit of Al2(SO4)3? How many atoms are in one mole of gold? How many electrons does aluminum have? How many atoms of C are present in 58.6 g of C_6H_6? How many moles of atoms are there in 6g of Carbon-13?
You can also figure out how many electrons are in its first, second and third orbitals: The first orbital can hold a maximum of two electrons, while the second has four suborbitals and so can hold a total of eight electrons. The third shell of an atom, which consists of nine suborbitals...
For example, a carbon atom has six protons and six electrons. It's not that simple though. An atom's properties can change considerably based on how many of each particle it has. If you change the number of protons, you wind up with a different element altogether. If you alter the ...
Nuclear materials — substances that emit nuclear radiation — are fairly common and have found their way into our normal vocabularies in many different ways. You have probably heard (and used) many of the following terms: Uranium Plutonium Alpha rays Beta rays Gamma rays X-rays Cosmic ray...
For example, when radioactive elements like uranium, radium and polonium decay, they release radioactive alpha particles. These particles, made up of protons and neutrons, are large and can only travel a short distance -- in fact, they can be stopped with just a piece of paper or even ...
You can think of this as counting each proton or neutron as 1 and ignoring the masses of electrons because they are so small in comparison. So the formula for relative atomic mass is simply: Relative atomic mass = number of protons + number of neutrons However, since scientists set a ...
(Actually, the O-shell could theoretically fit 50 electrons, but there is no known element with this many electrons.) How atoms become ionized Star-forming regions in space like the Orion Nebula pictured here are home to budding stars. Ultraviolet light from these young stars carves a cavity ...
Both isotopes of uranium are naturally radioactive; their bulky atoms disintegrating over time. Given enough time (hundreds of thousands of years), uranium will eventually lose so many particles that it will turn into lead. This process of decay can be greatly accelerated in what is known as ...
Atoms are the fundamental building blocks of all matter. Atoms consist of a dense, positively charged nucleus that contains protons and neutrons. Negatively charged electrons orbit the nucleus. All atoms of a particular element possess the same number of