Note: The correct trend of all factors should be kept in mind. Lagowski, Roger John Tayler Professor of Astronomy, University of Sussex, Brighton, England, 196795. Lagowski Professor of Chemistry, University of Texas at Austin. Ocean currents, chemistry and biology interact to control the horizontal and vertical distribution of elements in the ocean. atomic number 5 atomic weight 10.806, 10.821 melting point 2,200 ☌ (4,000 ☏) boiling point 2,550 ☌ (4,620 ☏) specific gravity 2. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. The element A would have a smaller atomic size than B. Periodic Table of Elements - The periodic table is the tabular arrangement of all the chemical elements on the basis of their respective atomic numbers. An authority on the distribution of elements in the Earth's crust. boron (B), chemical element, semimetal of main Group 13 (IIIa, or boron group) of the periodic table, essential to plant growth and of wide industrial application. (c)- The element A would have (greater/smaller) atomic size than B.Ītomic size or radius is the distance between the center of the nucleus and the outermost shell containing the electron.Ītomic size increases down the group and decreases while moving along the period. By convention, elements are organized in the periodic table, a structure that captures important patterns in their behavior. The element A would probably have a higher electron affinity than B. (b)- The element A would probably have (lesser/higher) electron affinity than B.Įlectron affinity is the tendency of an element to accept an extra electron and acquire a negative charge.Īs we move down the group the electron affinity decreases and as we move along the period the electron affinity increases. The element B would higher metallic character than A Metallic character increases down the group and decreases while moving along the period.
Metallic character is the tendency to lose an electron to form positive ions. Properties: Beryllium has a melting point of 1287+/-5☌, boiling point of 2970☌, specific gravity of 1.848 (20☌), and valence of 2. (a)- The element B would (lower/higher) metallic character than A. These colorful, fun, and informative periodic tables are great for. The atomic size decreases while moving from left to right in a period.Īs the question says element B is placed to the left of element A, therefore while moving from left to right in a period B will be the first element and A will be the second. The Periodic Table of the Elements, in Pictures and Words. The electron affinity increases while moving from left to right in a period. Hint: The metallic character decreases while moving from left to right in a period.
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