Skip to content Home Questions Play Progress Daily Challenge Questions › Chemistry › Structure of Atom Questions QUESTION Under ordinary room conditions, which listed metal has the greatest tabulated density? Open question → QUESTION Which listed scientist gave the element oxygen its name? Open question → QUESTION Ferrum is the Latin name for ___. Open question → QUESTION What was the three-letter systematic symbol associated with the former temporary element name unnilennium? Open question → QUESTION In 1887, the Royal Society, London gave the Davy Medal for the ‘discovery of the periodic law of chemical elements’ to ______. Open question → QUESTION In which year did AEB de Chancourtois organise the elements by atomic weight, by graphing the elements around a cylinder with a circumference of… Open question → QUESTION The Nobel Prize in Chemistry 1951 was awarded jointly to Edwin Mattison McMillan and ______ for their discoveries in the chemistry of the transuranium… Open question → QUESTION In the 1920s, who created the Left-Step Periodic Table (LSPT) of the chemical elements, basing the positions of the elements on patterns in the… Open question → QUESTION Who discovered three chemical elements: cerium, thorium and selenium, and devised the modern method by which one or two letters are used to symbolize… Open question → QUESTION In which year did Lavoisier and his collaborators publish Méthode de nomenclature chimique? Open question → QUESTION Which electronegativity scale, associated with work published in 1932, assigns fluorine the highest value, commonly rounded to 4.0? Open question → QUESTION With which scientist did William Ramsay show in 1894 that air also contained an element unknown until then, which was named Argon? Open question → QUESTION Which form of carbon was discovered in 1985 through work by a team including Robert F. Curl, Harold W. Kroto and Richard E. Smalley? Open question → QUESTION Which listed law was expressed in Lavoisier’s1789 Elements of Chemistry as the equality of the quantity of matter before and after a chemical operation? Open question → QUESTION J. Chadwick discovered which of the following subatomic particles in the year 1932? Open question → QUESTION Who received the 1904 Nobel Prize in Chemistry for work on inert gaseous elements in air and their place in the periodic system? Open question → QUESTION Consider the following statements. 1. Henry Moseley established atomic number through cathode-ray experiments. 2. Moseley’s law helped establish the ordering of the periodic table… Open question → QUESTION Who proposed the 1811 molecular hypothesis that reconciled Dalton’s atomic account with Gay-Lussac’s results on gas-combining volumes? Open question → QUESTION Urea, a commonly used nitrogen-based fertilizer, is prepared by the reaction between ammonia and ____. Open question → QUESTION An isotope of which listed element is used as a gamma-ray source in cancer radiotherapy? Open question → QUESTION Consider the following statements regarding atomicity: 1. The chlorine molecule (Cl₂) is diatomic. 2. Ozone (O₃) is triatomic. 3. Helium (He) is monoatomic. 4.… Open question → QUESTION Which colourless, odourless gas, relatively unreactive at ordinary temperatures, was identified by Daniel Rutherford in 1772? Open question → QUESTION Which radioactive isotope, with a half-life commonly stated as about 5730 years, is used to estimate the age of organic materials such as paper… Open question → QUESTION Consider the following statements: 1. The dash-wedge formula is used to represent the three-dimensional structures of molecules on a two-dimensional surface. 2. In the… Open question → Home Questions Play Progress 