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Element 41 (niobium) is theoretically unstable via spontaneous fission, but this has never been detected.Many other stable nuclides are in theory energetically susceptible to other known forms of decay, such as alpha decay or double beta decay, but no decay products have yet been observed, and so these isotopes are said to be "observationally stable".These include 905 nuclides that are either stable or have half-lives longer than 60 minutes. The existence of isotopes was first suggested in 1913 by the radiochemist Frederick Soddy, based on studies of radioactive decay chains that indicated about 40 different species referred to as radioelements (i.e.radioactive elements) between uranium and lead, although the periodic table only allowed for 11 elements from uranium to lead.Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons.The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.

The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively.

The neutron number has large effects on nuclear properties, but its effect on chemical properties is negligible for most elements.

Even in the case of the lightest elements where the ratio of neutron number to atomic number varies the most between isotopes it usually has only a small effect, although it does matter in some circumstances (for hydrogen, the lightest element, the isotope effect is large enough to strongly affect biology).

Synonyms: close, immediate, near, proximate These adjectives mean not far from another in space, time, or relationship: an airport close to town; her immediate family; his nearest relative; the proximate neighborhood. This may be fancy, though I think the memory of most of us can go farther back into such times than many of us suppose; just as I believe the power of observation in numbers of very young children to be quite wonderful for its of my pouch, happened to escape wetting in the sea (an inconvenience against which all prudent mariners take special care to provide,) I first cautioned the emperor not to be afraid, and then I let it off in the we always conversed, whenever good fortune and my ingenuity gave us the chance, with the greatest gaiety and cheerfulness, mingling tears, sighs, jealousies, doubts, or fears with our words; it was all on my part a eulogy of my good fortune that Heaven should have given her to me for my mistress; I glorified her beauty, I extolled her worth and her understanding; and she paid me back by praising in me what in her love for me she thought worthy of praise; and besides we had a hundred thousand trifles and doings of our neighbours and acquaintances to talk about, and the utmost extent of my boldness was to take, almost by force, one of her fair white hands and carry it to my lips, as well as the of Paris, thought that when a man had three names of his different estates joined one to another, he ought to be very happy in such a paradise; then he shook his head, saying, "If I were Porthos and D'Artagnan came to make me such a proposition as I am going to make to him, I know what I should say to it.

And when I turned my head to take a parting glance at the tug which had just left us anchored outside the bar, I saw the straight line of the flat shore joined to the stable sea, edge to edge, with a perfect and unmarked and noise, to have confinement, bad air, bad smells, substituted for liberty, freshness, fragrance, and verdure, was infinitely worse: but even these incitements to regret were feeble, compared with what arose from the conviction of being missed by her best friends, and the longing to be useful to those who were wanting her!

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