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Atomic Building Border Collie dog. Figure to assemble with nanoblocks. 950 pieces.

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All of the isotopes of carbon have the same number of protons; therefore, 13C has seven neutrons, and 14C has eight neutrons. Obviously something of a given mass is denser if it is smaller, so does this limit how small an object may be (An object of sufficient density would be a black hole would it not? Nor do I find it convincing to blame the failure to explain these things on the mathematical limitations of the audience. So the correct statement is not quite that “electrons are point-like” but that “electrons are not known not to be point-like”. About the weirdness: The problem is that if you make statements that *are* bizarre and you don’t say “yes, this is weird”, that confuses one set of people; and if you say “yes, this is weird” that makes the thinking-barrier you mentioned.

The tiny size of the nucleus relative to the whole atom, and its tendency to sit at the center of the atom, explains why it plays a relatively minor role in chemistry. Under such circumstances the most fruitful approach, it seems to me, is to be very humble and be very receptive to new ideas. b) The electrons of carbon completely fill its first electron shell, but only half-fills its second. The composition and the basic properties and ordening of the constituents are more important for understanding the atom casually.Instead of pursuing chemistry itself, a subject for a whole college course, we’ll continue on down to the subatomic particles, addressing along the way the other questions that are still unanswered. This principle is referred to as the octet rule, and it states that an atom will give up, gain, or share electrons with another atom so that it ends up with eight electrons in its own valence shell.

This is an amazingly difficult article to pull off; it’s supposed to be just a stage along the way to particle physics. A radioactive isotope is an isotope whose nucleus readily decays, giving off subatomic particles and electromagnetic energy. On the periodic table of the elements, mercury (Hg) has an atomic number of 80 and a mass number of 200.From the perspective of chemistry, the atomic number for a given kind of atom is determined by the amount of protons in the nucleus of that type of atom. I think that if you say the electrons have the shape of their orbitals, you will generate all sorts of problems later in explaining particle physics. So, electrons in an atom are organized by energy levels, and for a given level, there is an arrangement of electrons that is the most stable.

The radiologist then inserts tiny radioactive “seeds” into the blood vessels that supply the tumors.PET highlights areas in the body where there is relatively high glucose use, which is characteristic of cancerous tissue. Interventional radiologists are physicians who treat disease by using minimally invasive techniques involving radiation. Its atomic number is 92 (it has 92 protons) but it contains 146 neutrons; it has the most mass of all the naturally occurring elements. Maybe all the baggage carried along with the word, “particle” is an obstacle to a deeper understanding.

The idea that something is point-like is the statement that if and when you try to break it apart or detect its finite extent by banging something into it, you fail.So the best way to describe an atom that I can come up with is this: most of an atom’s mass is carried by the small nucleus that sits at its center, around which extremely tiny electrons, with much smaller mass, are spread out (through the weirdness of quantum mechanics) in a most un-particle-like way, filling the grey area in Figure 2.

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