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Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, ... (F: 3.98, Cl: 3.16, Br: 2.96, I: 2.66), and is less ...
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 ...
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.
The halogens (/ ˈ h æ l ə dʒ ə n, ˈ h eɪ-,-l oʊ-,-ˌ dʒ ɛ n / [1] [2] [3]) are a group in the periodic table consisting of six chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and the radioactive elements astatine (At) and tennessine (Ts), though some authors [4] would exclude tennessine as its chemistry is unknown and is theoretically expected to ...
6NiO + 4 ClF 3 → 6 NiF 2 + 3 O 2 + 2 Cl 2 AgCl + ClF 3 → AgF 2 + ClF + 1/ 2 Cl 2. ClF 3 is used to produce uranium hexafluoride: U + 3 ClF 3 → UF 6 + 3 ClF. With phosphorus, it yields phosphorus trichloride (PCl 3) and phosphorus pentafluoride (PF 5), while sulfur yields sulfur dichloride (SCl 2) and sulfur tetrafluoride (SF 4).
Chlorine (17 Cl) has 25 isotopes, ranging from 28 Cl to 52 Cl, and two isomers, 34m Cl and 38m Cl. There are two stable isotopes, 35 Cl (75.8%) and 37 Cl (24.2%), giving chlorine a standard atomic weight of 35.45.
Fluorine is a chemical element; it has symbol F and atomic number 9. It is the lightest halogen [ note 1 ] and exists at standard conditions as pale yellow diatomic gas. Fluorine is extremely reactive as it reacts with all other elements except for the light inert gases .
Other examples of ionic chlorides are sodium chloride NaCl, calcium chloride CaCl 2 and ammonium chloride [NH 4]Cl. The chloride is also a neutral chlorine atom covalently bonded by a single bond to the rest of the molecule. For example, methyl chloride CH 3 Cl is an