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Which would be least reactive because its last electron shell is full with 2 electrons 1.helium 2.neon 3.lithium 4 bromine?
Wiki User
∙ 13y ago
helium
Wiki User
∙ 13y ago
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How man protons are found in an atom?
Depends what it's an atom OF.Hydrogen . . . 1Helium. . . . . . 2Lithium . . . . . 3Gold. . . . . . . 79Uranium. . . . 92etc.
What is a direct consequence of the number of protons and neutrons in an atom's nuceuls?
Number of proton = atom numberfor example:Hydrogen has 1 proton and its atom number is also 1Number of neutrons + number of protons = mass numberfor example:Hydrogen have 1 proton and and NO neutrons, so the mass number is 1Helium has 2 protons and and 2 neutrons, so the mass number is 4
How does energy produced by nuclear fusion move from sun's core to space?
As 4 hydrogen atoms fuse to make the 1helium energy is release in the process. The atomic mass of hydrogen is 1.00794 and it takes 4 of them. The atomic mass of helium is 4.002602. 4 * 1.00974 (hydrogen atomic mass) = 4.03176 But helium's atomic mass is less than that at 4.002602 There is a missing 0.029158 worth of mass that didn't become helium. The missing mass is converted into energy when the 4 hydrogen's are created by the equation E=mc2. The core is so tightly compressed that this energy "bounces" around being reabsorbed and re-emitted for about 100,000 years, yes I know that sounds made up but this is what I learned in Astronomy. Once it reaches the surface of the sun it is released as the Electromagnetic Spectrum which is Gamma, X-ray, ultraviolet, visible, infrared, microwave radiations, and radio waves. In stars much larger than our sun all the elements up to Iron are formed. Anything heavier than Iron it is theorized are made in supernova.
