2017年1月24日 · Ultimately, the number of protons is what determines the atomic number. For example, helium has two protons, so its atomic number is two (and it appears second on the periodic table of elements)....

For far-apart protons, the electric force is greater.) A certain isotope has a half-life of one day. This means the amount of that isotope remaining at the end of two days will be. We have an expert-written solution to this problem! When an element ejects an alpha particle, the atomic number of the resulting element.

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2018年12月8日 · A proton is a subatomic particle with a positive charge. It resides in the atomic nucleus. Atoms consist of smaller particles called protons, neutrons , and electrons .

The half-life of an isotope is one day. At the end of two days the amount that remains is A. none. B. one-half. C. one-quarter. D. one-eighth. E. none of these

Since the mean life time of proton is >2.1×1029 years and since all stars, suns and matter are made of protons, then the big bang did not happen 13.7 billions years ago. when a star is dead, it means that no enough hydrogen (proton) is there for burning

2009年5月18日 · The water atom containing our proton crashes into a small rocky planet in the star’s goldilocks zone and becomes part of a great ocean, where it is eventually taken up into a sequence of living creatures and excreted again. This brings out proton from the Big Bang to the present day, through three generations of star formation.

Because we start with six protons, but end up putting two back into the plasma, the net result is that four protons are taken out of the soup and produce one 42 He. This sequence of three reactions is called the proton-proton cycle.

What molecule does the electron end up in at the end of the two light reactions (i.e. After Photosystems II and I)? What is the proton gradient used for? What does the term 'carbon fixation' refer to? During the light-independent reactions, the Calvin Cycle requires NADPH and ATP. Where does the cell get these molecules?

2014年4月28日 · A proton is made up of two up quarks and one down quark. A neutron is one up quark and two down quarks. Quarks are also Fermionic particles like electrons, except with different properties like spin, mass, and electric charge.