content: /*
  * Copyright (c) 1997 - 2016
  * Actelion Pharmaceuticals Ltd.
  * Gewerbestrasse 16
  * CH-4123 Allschwil, Switzerland
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice, this
  *    list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. Neither the name of the the copyright holder nor the
  *    names of its contributors may be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
  package com.actelion.research.chem.forcefield.mmff;
  
  public final class PeriodicTable {
      private PeriodicTable(){};
  
      /**
       * Returns which row in the periodic table an atom with given atomic
       * number is in.
       *  @param ano Atomic number of the given atom.
       *  @return The periodic table row of the given atom.
       */
      public static int row(int ano) {
          if (ano < 3)
              return 0;
          else if (ano < 11)
              return 1;
          else if (ano < 19)
              return 2;
          else if (ano < 37)
              return 3;
          else if (ano < 55)
              return 4;
          return 0;
      }
  
      /**
       * Returns which row in the periodic table an atom is in with transition
       * metals having their row number multiplied by 10. Hydrogen is counted in
       * row 0 while helium is counted in row 2.
       *  @param ano The atoms atomic number.
       *  @return The periodic table row.
       */
      public static int rowtm(int ano) {
          int row = 0;
  
          if (ano == 2)
              row = 1;
          else if (ano >= 3 && ano <= 10)
              row = 2;
          else if (ano >= 11 && ano <= 18)
              row = 3;
          else if (ano >= 19 && ano <= 36)
              row = 4;
          else if (ano >= 37 && ano <= 54)
              row = 5;
  
          if (ano >= 21 && ano <= 30 || ano >= 39 && ano <= 48)
              row *= 10;
  
          return row;
      }
  }
  