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Dubai

IGCSE Chemistry Periodic Table

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Published in: Chemistry
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Here we will discuss about the Periodic Table , groups , periods properties of grope one elements

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Qualification: Master of science in chemistry(MSC CHEMISTRY), Bachelors of science in Chemistry, ( BSC biology) Biology , A levels , o levels

Teaches: Biology, Chemistry, Microbiology, Biochemistry, Molecular Biology, IGCSE/AS/AL, Science, Environmental Science, Maths, Home Science

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  1. LEARN CHEMISTRY WITH BABAR IGCSEC MISTRY PERIODIC TABLE CAMBRID E, OXFORD AQA , AND EDXCEL
  2. peapooqc Periodic table, in chemistry the organized arrayof all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus . When the chemical elements are thus arranged, there is a recurring pattern called the 'periodic law" in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry l. Mendeleev in the mid-19th century, has been of inestimable value in the development of chemistry.
  3. V4RSAON OF PEQUOOÅC on an earlier (1882) model of T. Bayley, J. Thomsen in 1895 devised a new table. This was interpreted in terms of the electronic 3Vu«æof atoms by Niels Bohr in 1922. In this table there are periods of increasing length between the noble gases; the table thus contains a period of 2 elements, two of 8 elements, two of 18 elements, one of 32 elements, and an incomplete period. The elements in each period may be connected by tie lines with one or more elements in the following period. The principal disadvantage of this table is the large space required by the period of 32 elements and the difficulty of tracing a sequence of closely similar elements . A useful compromise is to compress the period of 32 elements into 18 spaces by listing the 14 lanthanoids (also called lanthanides and the 14 actinoids (also called äéfiöfåé$fn a special double row below the other periods.
  4. PERIODIC TABLE OF ELEMENTS Chemical Group Block Pub@he 17 zr La Ta Db cu Ag Rg Gd cm Zn Cd cn w Pa Mn Re Nd u Ru Os Hs Pm co Rh Mt sm Pt Am Ga cf sn Pb Ho AS sb Mc er PERIODIC TABLE ELEMENTS periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number
  5. OF The Periodic table is a method of classifying elements. Elements are arranged in order of increasing atomic number (each proceeding element has one more proton) Made up of rows called periods and columns called groups, the position of an element helps determine its electronic configuration. Period number: number of electron shells Group number: number of outer shell electrons Elements in the same group have similar chemical properties.
  6. peapooqc The table moves from metals on the left to non-metals on the right. Down a group of metals, elements become more reactive. With non-metals going down a group, reactivity decreases.
  7. GROUP Chemical Properties Readily react with oxygen and water; stored in oil React violently with chlorine Burst into flames when heated with oxygen[red flame for lithium; yellow flame for sodium; lilac flame for potassium] Produce soluble white compounds. React with water to form alkaline Physical Properties Good conductors of heat and electricity Soft and easy to cut Shiny when freshly cut Melting points decrease down the group. Increase density down the group metal and hydrogen gas
  8. OF OTHER GROUP CAESßU* ANO FUNCOUJWi (REACTOVOTY "NCREASES DOWN GROUP) Element Lithium Sodium Potassium Reaction with Water Floats and gives off hydrogen gas (effervescence) Vigorous Reaction and moves very quickly Explosive Reaction, lilac flame
  9. GROUP PROPERTUES Properties Patterns States and Colours, at RTP: Fluorine- Yellow-green gas Down the group, size, mass and Chlorine- Pale Yellow-Green gas density increase Bromine- Red-Brown liquid Iodine- Grey-Black solid Down the group, the colour Poisonous darkens Reactivity decreases down the group, because it has to gain an electron, Diatomic; form halide ions in a so the closer the electron is to displacement reaction the positive nucleus, the more easily it will be gained, so atoms with fewer shells will react more easily. melting point increases down the Do not conduct electricity group
  10. TRANSATAON Physical Properties High melting & boiling points Malleable and ductile Good conductors of heat & electricity High density Chemical Properties Act as catalysts Form coloured compounds Variable Oxidation Numbers (Iron (Il) or Iron (Ill) )
  11. CASES Properties Density increases down the group Monoatomic and colourless M.P. and B.P. increases down the group Don't conduct electricity Inert & stable due to full outer shell electrons Uses Helium-filling balloons Argon — Lamps Neon — advertising signs to deter chemical reactions. to protect species

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