optionA_Title = "A. Yes";
optionB_Title = "B. Maybe later";
optionC_Title = "C. They are all homogeneous.";
optionD_Title = "D. Some are homogeneous and other composite.";
optionE_Title = "E. They are all composite.";
optionF_Title = "F. Yes";
optionG_Title = "G. Protons orbit the nucleus, which consists of neutrons and electrons.";
optionH_Title = "H. Neutrons orbit the nucleus, which consists of protons and electrons.";
optionI_Title = "I. Electrons orbit the nucleus, which consists of protons and neutrons.";
optionJ_Title = "J. Yes";
optionK_Title = "K. The atomic number is the number of protons, while the mass number is the sum of protons and neutrons.";
optionL_Title = "L. The atomic number is the sum of protons and neutrons, while the mass number is the number of protons.";
optionM_Title = "M. Focus on a molecule of Water.";


introFirst="Hi, my name is Bohr, how is it going with your study? would you like to set out on a quest for the structure of matter? ";
introRest="Welcome back, are you interested for the quest?";
// ------ TEXT DISPLAYED WHEN AN OPTION IS SELECTED
optionA_Text ="Great. Take a look at these objects. Do you think they are homogeneous or composite of different elements?
";

optionB_Text ="Ok. Any time!";

optionC_Text ="Well, there are a few materials which consist of only one element, like gold or diamond. But most materials are composite. For example, when we breathe we bring in oxygen and flush out carbon dioxide. So, although air seems homogeneous, it is actually composite of several chemical elements. So are water, soil and other materials. Do you want to take a look at the elements of water?
";

optionD_Text ="Correct! 
Do you want to take a look at the elements of water?  

";

optionE_Text ="Well there are a few materials which consist of only one element, like gold or diamond. But it is true that most of them are composite, like air, water, soil and other materials.
Do you want to take a look at the elements of water? 

";

optionF_Text ="All right, take a close look.
 ";

optionG_Text ="Actually, the particles orbiting the nucleus are the electrons. Protons and neutrons constitute the nucleus.
Do you want to take a closer look at the atom of oxygen? 
 ";
 
optionH_Text ="Actually, the particles orbiting the nucleus are the electrons. Protons and neutrons constitute the nucleus.
Do you want to take a closer look at the atom of oxygen? 
 ";
optionI_Text ="Exactly!
Do you want to take a closer look at the atom of oxygen? 
 ";

optionJ_Text1 ="Great, this will be our final destination.
 ";

optionJ_Text2 ="An atom of oxygen consists of 8 neutrons, 8 protons and 8 electrons. Do you know how we define the “atomic number” and the “mass number” of oxygen? 
 ";


optionK_Text ="That's correct!
It was nice having this conversation. I wish you continue your study with growing interest.
 ";

optionL_Text ="In fact it's the other way round: The atomic number is the number of protons, while the mass number is the sum of protons and neutrons. 

It was nice having this conversation. I wish you continue your study with growing interest.
 ";



optionM_Text ="As you can see, a molecule of water consists of two chemical elements: oxygen and hydrogen. In particular, it comprises one atom of oxygen and two atoms of hydrogen.  
But every atom consists of smaller particles: neutrons, protons and electrons. Do you remember its structure?

 ";