Identifying The Element - Answers
Using your own knowledge, your chemistry textbook, or any other appropriate chemistry resource book, identify the element, using each of the following clues.

Name
Symbol
1.   Used in house light bulbs, a gas
Argon
Ar
2.   The gas used in coloured light signs
Neon
Ne
3.   Makes up about 20% of the air    
Oxygen
O
4.   Plumbers used it for pipes, used less today 
Lead
Pb
5.   Used in films, turns black in light, negatives   
Silver
Ag
6.   Found in these forms: charcoal, graphite, diamond
Carbon
C
7.   Glows in the dark, on some hands of the clock  
Radon
Ra
8.   Main metal in 25 cents pieces today   
Nickel
Ni
9.   Found in limestone, chalk, shells and teeth
Calcium
Ca
10. Makes up 78% of the air      
Nitrogen
N
11. A gas, necessary for breathing     
Oxygen
O
12. The metallic element in ordinary table salt 
Sodium
Na
13. Used in photographic flash bulbs because it burns to produce a brilliant white light, also fireworks. 
Magnesium
Mg
14.  The element used in electrical wiring and pennies 
Copper
Cu
15.  Element obtained commercially from seawater 
Bromine
Br
16.  The protective coating on water taps, shiny
Chromium
Cr
17.  The elements in ordinary fertilizer  
Nitrogen
N
18.  Metal element that carries oxygen in the blood 
Iron
Fe
19.  The second most abundant element in the Earth's crust  - found in glass
Silicon
Si
20.  Used to kill bacteria in swimming pools
Chlorine
Cl
21.  The element used in your good cutlery     
Silver
Ag
22.  The alloy of copper and this element make brass 
Zinc
Zn
23.  Quicksilver, used in fluorescent light tubes Mercury
Hg
24.  The element used in making steel
Iron
Fe
25.  The element produced in Kitimat BC from bauxite 
Aluminum
Al
26.  The element used in light-bulb filaments
Tungsten
W
27.  The element that used to be added to most gasolines to prevent knocking  
Lead
Pb
28.  Used in match heads, rubber tires, and insecticides
Sulphur
S
29.  In toothpaste, protective coating for teeth, Teflon
Fluorine
F
30.  A metal used for jewellry, white, high monetary value
Platinum
Pt
31.  The element used in thermometers
Mercury
Hg
32.  The lightest known gas: sun consists mainly of it
Hydrogen
H
33.  Used for X-ray and radiation shields 
Lead
Pb
34.  Latin name aurum, used to fill holes in teeth
Gold
Au
35.  Added to ordinary table salt to control thyroid trouble
Iodine
I
36.  An element used in nuclear reactors for energy
Pu or U

37.  An element named after the planet Pluto - stays radioactive for millions of years, dangerous 
Plutonium
Pu
38.  In honour of Pierre and Marie Curie, pioneers in the field of radaioactivity    
Curium
Cm
39.  The lead in lead pencils
Carbon
C
40.  Bronze is composed of copper and this element
Tin
Sn
41.  The center electrode post of ordinary flashlight batteries 
Carbon
C
42.  The metal plates in car batteries 
Lead
Pb
43.  Used in the making of atomic clocks that lose one second every 300 years   
Cesium
Cs
44.  Used in the making of supersonic airplane wings and artificial joints for bones,  modern submarine hulls
Titanium
Ti
45.   Used to make high-speed drills and abrasives
Carbon
C
46.   Used to make light-sensitive photo cells for camera, electric eyes and fire alarms
Selenium
Se
47.   Used extensively in making transistors and chips
Silicon
Si
48.   Used in poisons to kill rats and insects
Arsenic
As
49.   Used as a catalyst in catalytic converters in car exhaust systesm to get rid of pollution
Platinum
Pt
50.   Used in the Goodyear blimp and other dirigibles 
Helium
He