Position of Period 1 Elements in The Periodic Table
Although both hydrogen and helium are in the s-block, neither of them behaves similarly to other s-block elements. Their behaviour is so different from the other s-block elements that there is considerable disagreement over where these two elements should be placed in the periodic table.
Hydrogen is sometimes placed above lithium, above carbon, above fluorine, above both lithium and fluorine (appearing twice), or left floating above the other elements and not assigned to any group in the periodic table.
Helium is almost always placed above neon (which is in the p-block) in the periodic table as a noble gas, although it is occasionally placed above beryllium due to their similar electron configuration.
Read more about this topic: Period 1 Element
Famous quotes containing the words position of, position, period, elements, periodic and/or table:
“They aroused me to a determination to understand more fully the position of women, and the character of those men who talk so much of the need of our being “protected”Mremoving from us, meanwhile, what are often the very weapons of our defence [sic], occupations, and proper and encouraging remuneration.”
—Harriot K. Hunt (1805–1875)
“It is easier to appear worthy of a position one does not hold, than of the office which one fills.”
—François, Duc De La Rochefoucauld (1613–1680)
“Not only do our wives need support, but our children need our deep involvement in their lives. If this period [the early years] of primitive needs and primitive caretaking passes without us, it is lost forever. We can be involved in other ways, but never again on this profoundly intimate level.”
—Augustus Y. Napier (20th century)
“Three elements go to make up an idea. The first is its intrinsic quality as a feeling. The second is the energy with which it affects other ideas, an energy which is infinite in the here-and-nowness of immediate sensation, finite and relative in the recency of the past. The third element is the tendency of an idea to bring along other ideas with it.”
—Charles Sanders Peirce (1839–1914)
“It can be demonstrated that the child’s contact with the real world is strengthened by his periodic excursions into fantasy. It becomes easier to tolerate the frustrations of the real world and to accede to the demands of reality if one can restore himself at intervals in a world where the deepest wishes can achieve imaginary gratification.”
—Selma H. Fraiberg (20th century)
“In New York, pretending to be above the struggle means no seat on the bus and a table next to the kitchen.”
—Mason Cooley (b. 1927)