CASTLE MENDELEEV

You and your friends have been magically transported inside an 18 room castle built by the famous chemist Dmitri Mendeleev.  Each room is entirely made from one of the elements of the first three rows of the periodic table.  No element is repeated.  Each element will appear in the state (solid, liquid, or gas) it retains at room temperature.

You do not know where in the castle you have been transported.  A holographic image of Mendeleev will accompany you on your journey, giving you clues to help you determine which room you are in.  Each time you identify the element a room is made of, you will be transported to another room.  Once you travel through all of the rooms, you will find your way out of Castle Mendeleev.
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1.)
  You and your friends have suddenly materialized into a room made entirely of a shiny metallic solid.  A wooden door is set into one wall.  A shimmering holograph appears before you.  It is an old man with long brown hair and a full beard streaked with gray hairs.  Wearing a full nineteenth-century topcoat, it is Dmitri Mendeleev himself.  In a crisp, intelligent voice, the scientist says, "This room has been constructed of a strong, lightweight, corrosion-resistant metal composed of atoms containing 3 valence electrons and 13 protons.  It is the most abundant metal in the Earth's crust."  What element is this room make of?  Carve its symbol into the wooden door to escape to the next room.

2.)  The next room you find yourselves in is made of a clear, life-giving gas.  Suddenly, Mendeleev appears again saying, "This element is a nonmetal, diatomic gas that comprises about 20 % of normal air.  It combines with most other elements to form oxides."  What symbol will you carve into the door of this room?

3.)  Next, you and your friends are transported to a room made from a green-yellow gas which immediately begins to burn your nostrils and your throat.  You reach into your packs for gas masks to protect yourselves from these noxious fumes.  For the third time, a holograph of Mendeleev speaks to you through the shifting gas.  "This diatomic gas is a halogen."  What element surrounds you?

4.)  In the next room you find yourselves surrounded by bright yellow crystals.  As you remove the gas masks, the old chemist, tinted yellow by light reflecting off the crystals, appears yet again.  "The atoms of this element have 6 valence electrons."  Carve the symbol of the correct element in the room's door.

5.)  You are now in a room made of a clear gas - located in one of the towers of the Castle Mendeleev.  Trying to talk to your friends, your voice sounds high-pitched and squeaky, like Mickey Mouse.  The holograph tells you, "The atoms of this element are also molecules."  What element is this room made of?

6.)  The sixth room you are transported to, on the first floor of the building, is made of a silver-gray metallic solid.  Taking a knife out of your backpack, you are able to cut a piece of it off with the blade because the substance is very soft.  A portion of the element touches your hand, burning your skin.  Filling a small glass beaker with water from your canteen, you drop the substance in to observe its reaction with water.  It momentarily floats on the water before causing a small explosion.  What element is this?

7.)  Next you are transported to a room with bright, white waxy walls.  When you turn off the lights, the entire room glows in the dark!  The holograph tells you, "This element occurs in teeth and bones as calcium phosphate."  What element is this room comprised of?

8.)  You are now in a room made of a shiny, silver metal.  The image of Mendeleev reappears to say, "This element appears here in its pure form.  If combined with traces of other elements, it becomes a semiconductor that is used in circuits of electronic devices such as calculators.  It and oxygen are the two elements that make sand but not diamonds."  What element is he speaking of?

9.)  The ninth room is composed of a gas that has no color, taste, or odor.  A transparent image of the chemist tells you, "An atom of this element has 2 electrons in its first energy level and 5 electrons in its second energy level.  This element makes up approximately 80 % of normal air and can be used to make laughing gas."  What is the element?

10.)  The next room you are transported to is made of a soft white material.  The nineteenth-century chemist states, "The atoms of this element have a low electron affinity and will replace hydrogen atoms when placed into water.  This room is on the second floor of my castle."  Which element is this?

11.)  Next, you are transported to a room in the corner of the Castle Mendeleev.  The room is made of a thick, inert gas.  Mendeleev flickers into view to tell you, "This element is used to fill light bulbs.  The atoms of this element have 8 electrons in their third energy level."  Carve the correct symbol into the door.

12.)  After escaping from room eleven, you materialize into a room made of a solid substance.  Mendeleev's image appears in front of you and says, "This element is the basic unit for all living things.  Without it, jewelers would go broke, gas stations would go out of business, and every breath you exhale would be incomplete.  The element has two isotopes, one has 6 neutrons and the other has 8 neutrons."  What element is this room constructed of?

13.)  The next room you enter is filled with an inert gas.  Mendeleev appears, telling you, "This gas emits a brilliant orange-red light when contained in a discharge tube.  Las Vegas wouldn't be the same without this element."  What is the element?

14.)  This room is made of a light gray metal.  Again the image of Mendeleev speaks, "This element is so strong, hard, and elastic that it is used to reinforce other metals.  Its melting point is nearly 1300 oC."  What element is this room made of?

15.)  The next room is made of a hard, black, shiny material, and then suddenly it changes to a brown powder.  The holograph of the chemist tells you the atoms of this element have 2 energy levels, and it conducts electricity and heat very poorly.  But, because it readily absorbs neutrons, it is used in control rods for nuclear reactors.  What element built these walls?

16.)  The sixteenth room you enter is made of a green-yellow gas.  The image tells you, "The atoms of this element have a high electron affinity.  When one combines it with sodium, it can help reduce tooth decay.  It also reacts with hydrocarbons to form Teflon and Freon."  What element is he speaking of?

17.)  Next you have been transported to a room on the first floor of the Castle Mendeleev. It is made of a white solid.  The holograph of Dmitri Mendeleev reappears, shifting before you like a milky ghost, speaking to you once more.  "This element is widely used in aerospace industries in alloys with other metals.  It burns a brilliant white color in air.  The atoms of this element form positive ions.  One of its atoms will combine with one oxygen atom to form a compound."  The walls of this room are comprised of what element?

18.)  You finally find yourself in the second tower of Castle Mendeleev.  The room is made of a transparent gas.  This element is the simplest and lightest of all the elements.  It is the most abundant element in the universe.  What element is it?

Upon carving the correct symbol into the final door, you and your friends are transported to a large dining hall.  The holographic image of Dmitri Mendeleev, who has accompanied you throughout your journey, stands at the end of a long table set for dinner.  Speaking to your group for the last time, he says, "Congratulations adventurers.  Come, have a seat and drink to your victory with a toast of complex carbon, hydrogen, and oxygen compounds dissolved into a liquid compound of hydrogen and oxygen."  Don't worry, it's just lemonade.

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