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A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
The periodic table and law are now a central and indispensable part of modern chemistry. The periodic table continues to evolve with the progress of science. In nature, only elements up to atomic number 94 exist; [a] to go further, it was necessary to synthesize new elements in the laboratory.
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
C 5 H 10: cyclopentane: 287-92-3 C 5 H 10 N 2 O 3: glutamine Gln: 56-85-9 C 5 H 10 O 2: pivalic acid: C 5 H 10 O 2: valeric acid: C 5 H 10 O 2: 3-Methylbutanoic acid: C 5 H 10 O 4: deoxyribose: 533-67-5 C 5 H 11 NO 2: valine Val: 660-88-8 C 5 H 11 NO 2 S: methionine Met: 25343-91-3 C 5 H 12: pentane: 109-66-0 C 5 H 12 O 2: neopentyl glycol: 101 ...
[10] Thirty-three artificial isotopes of zirconium have been synthesized, ranging in atomic mass from 77 to 114. [10] [17] 93 Zr is the longest-lived artificial isotope, with a half-life of 1.61×10 6 years. Radioactive isotopes at or above mass number 93 decay by electron emission, whereas those at or below 89 decay by positron emission.
Livermorium is projected to be the fourth member of the 7p series of chemical elements and the heaviest member of group 16 in the periodic table, below polonium. While it is the least theoretically studied of the 7p elements, its chemistry is expected to be quite similar to that of polonium. [4]
In the periodic table, it is a d-block transactinide element. It is a member of the 7th period and is placed in the group 10 elements, although no chemical experiments have yet been carried out to confirm that it behaves as the heavier homologue to platinum in group 10 as the eighth member of the 6d series of transition metals.
Cerium is a chemical element; it has symbol Ce and atomic number 58. It is a soft , ductile , and silvery-white metal that tarnishes when exposed to air. Cerium is the second element in the lanthanide series, and while it often shows the oxidation state of +3 characteristic of the series, it also has a stable +4 state that does not oxidize water.
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