words‚ each element has a unique number that identifies how many protons are in one atom of that element. For example‚ all hydrogen atoms‚ and only hydrogen atoms‚ contain one proton and have an atomic number of 1. All carbon atoms‚ and only carbon atoms‚ contain six protons and have an atomic number of 6. Oxygen atoms contain 8 protons and have an atomic number of 8. The atomic number of an element never changes‚ meaning that the number of protons in the nucleus of every atom in an element is always
Premium Isotope Neutron Radioactive decay
table (4.3 and 4.4) the trace elements was detected by using the flame atomic absorption spectrophotometry analysis. The trace metal can be detected by the FAAS within 15 seconds to 30 seconds of each soil sample. Before the samples were analysis with the FAAS‚ the blank samples were run in the machine for each element that was being analyzed. Their absorbances were read. The mean of each blank was calculated and hence the detection limits determined for each element‚ which are for magnesium‚ manganese
Premium Manganese Chemical element Iron
property of carbon element responsible for a large number of compounds having carbon. (1) 8. On what basis did Mendeleev arrange the elements in his periodic table? On what basis are they arranged now? (2) 9. Three elements A‚B & C have electronic
Free Periodic table Chemical element Chemistry
principal quantum number n = 3‚ can be accommodated in an atom? A 6 B 9 C 14 D 18 6. The first ionisation energies‚ in kJ mol-1‚ of Group II and III elements are given below: Group II Group III Be 900 B 799 Mg 736 Al 577 Ca 590 Ga 578 (a) Define‚ by means of an equation‚ what is meant by the first ionisation energy of an element. (b) Explain why the first ionisation energies decrease in magnitude on descending Group II. (c) Explain why the first ionisation energy of aluminium
Free Atom Chemical element Quantum mechanics
pure substance – element mixture – homogeneous pure substance – compound mixture – heterogeneous 1. HCl (aq) mixture – homogeneous 2. sugar pure substance – compound 3. KBr (s) pure substance – compound 4. soil mixture – heterogeneous 5. Cl2 (g) pure substance – element 6. water pure substance – compound 7. CH2(OH)2 (aq) mixture – homogeneous 8. sodium pure substance – element 9. Hg (l) pure substance – element 10. iron oxide pure
Premium Temperature Chemistry Celsius
Group IA‚ IIA and IVA elements. Each of the samples was placed in a test tubes and the physical state‚ color‚ and appearance was identified. The solubility of the element was tested through the use of water. The Group IIA Metal Oxides was tested through the use of the pink and blue litmus paper. Also a balanced equation was written to show the reaction between oxides and water. II. INTRODUCTION Chemical periodicity is defined as the similarities of chemical elements that are close to each
Premium Chemistry Periodic table Chemical element
must meet three elements to establish a defense of necessity to DUI. He will likely meet all three elements because he drove under the influence only to prevent a significant evil‚ the harm he caused was disproportionate to the harm avoided‚ and driving was his last adequate option in hopes to avoid the impending dangers of Hurricane Katrina. ESCAPE Probably yes. McAnzen will probably be able to evade an escape charge because under Mississippi Law a prisoner must meet four elements to establish
Premium Hurricane Katrina Tropical cyclone Mississippi
Ever heard of the element Bismuth? Bismuth (Bi) is atomic number 83‚ and its weight is 208.98040. This element is not one of the more popular ones that most people know; like Cooper (Cu)‚ Aluminum (Al)‚ and Hydrogen (H). Even though bismuth may not be one of the elements that everyone knows‚ there is many objects that we use that has bismuth in it. Once a person reads bismuths biography‚ and learns what objects has bismuth in them; it is actually a neat element. Bismuth was discovered by an unknown
Premium Oxygen Chemistry Hydrogen
halogen element Any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F)‚ chlorine (Cl)‚ bromine (Br)‚ iodine (I)‚ astatine (At)‚ and element 117 (temporarily named ununseptium [Uus]). They were given the name halogen‚ from the Greek roots hal- (“salt”) and -gen (“to produce”)‚ because they all produce sodium salts of similar properties‚ of which sodium chloride—table salt‚ or halite—is best known. Because of their great
Premium Chlorine Chemical element
periodic table. The table is laid out in the order of the atomic weight of each element. He wrote‚ in his book‚ that he arranged every element known to man just by their atomic mass and weight. He understood the science of elements and how they worked better than anyone else of his day. He guessed about future elements‚ as well‚ and what their properties might be. He also provided places for these possible new elements in the periodic table. At the time‚ however‚ a lot of people did not care for
Free Periodic table Chemical element Dmitri Mendeleev