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1. Actinium (7046 bytes)
   2: {| border="1" cellpadding="2" cellspacing="0" align="right...
   5: {| align="center" border="0"
   20: | [[Chemical series]] || [[Actinide]]s
   25: | [[Density]], [[Mohs hardness scale|Hardness]]
   26: | 10070 [[kilogram per cubic metre|kg/m³]], n/a
2. Heart (10132 bytes)
   1: ...Image:Heart_crca.jpg|thumb|right|230px|Image provided by [http://classroomclipart.com Classroom Clip A...
   3: ... language|Greek]] ''kardia'' (καρδια) for "heart".
   7: ...e [[lung]]s. In adults, it weighs about 300-350 [[gram|g]]. It consists of four chambers, the two upper ...
   9: A thick muscular wall, the [[septum]], divides the right atrium and ventricle from the left atr...
   15: ...takes places and the blood releases [[carbon dioxide]] into the lung cavity and picks up [[oxygen]]. T...
3. Mercury (planet) (22924 bytes)
   1: ...anges from −0.4 to 5.5 in [[apparent magnitude]]; Mercury is sufficiently "close" to the Sun tha...
   3: ...not realized it could alternately appear on one side of the Sun and then the other. It was called [[He...
   12: ...aded [[Impact crater|crater]]s, where it has been deposited by [[comet]] impacts and/or gases arising ...
   16: ...idal bulge]]s, raised by the [[Sun]] (the Sun's tides on Mercury are about 17% stronger than the Moon'...
   28: ...of Earth compresses the planet and creates a high density. Mercury has only 5.5% of Earth's mass. The ...
4. Polar bear (6417 bytes)
   15: ..., 1.9 to 2.1 m. At birth, cubs weigh 600 to 700 [[gram|g]]. Population estimates range from 16,000 to 35...
   20: ... barely visible. Only the pads of their feet emit detectable heat.
   22: ...y include [[beluga whale]]s, [[walrus]]es and [[rodent]]s. As a pure carnivore predating upon [[fish]...
   24: ...ed 15–25 percent between 1995 and 2005. The decrease in several regions was caused by hunting, n...
   26: ...itions. The bears were washed in a [[peroxide blonde]] solution to restore their expected color. A sim...
5. Nutrition (42689 bytes)
   1: ...[2005]], is a general nutrition guide for recommended [[food]] consumption.]]
   2: ...bsence of adequate nutrients may cause disease or death.
   4: ...y incur [[toxic]] and potentially lethal effects, depending on the dose.
   5: The science of nutrition attempts to understand how and why specific dietary aspects influe...
   12: rapidly dehydrate; (hence the devastating effects of persistent [[diarrhea]]).
6. Tobacco smoking (36030 bytes)
   2: ...ly [[lung cancer]], [[emphysema]], and other disorders.
   4: ...alth hazards of smoking, the practice has rapidly declined in recent years in the [[United States]], [...
   8: ..."as addictive as heroin or cocaine."{{fn|1}} Dependence is strongest when tobacco smoke is inhaled int...
   10: ...s balanced by its immediate rewards, while others deny the risks altogether.
   13: ...co was used as an all-purpose medicine, and was widely believed to have magical powers, It was also bu...
7. Tangram (4661 bytes)
   1: '''Tangram''' is an ancient [[China|Chinese]] [[puzzle]].
   4: [[Image:Tangram diagram.png]]
   9: * 1 [[parallelogram]]
   14: ...em]] was discovered in the Orient with help of Tangram pieces.
   16: The puzzler [[Sam Loyd]] devised many tangram puzzles.
8. Atomic mass (3063 bytes)
   2: ...|thumb|150px|left|Chemistry Clipart .Clipart provided by [http://classroomclipart.com Classroom Clip A...
   3: ... integer: in most cases the first digit after the decimal point is 0 or 9. This integer is called the ...
   5: ...viate from their mass numbers is as follows: the deviation starts positive at [[hydrogen]]-1, becomes...
   7: ...f the element's atoms, often referred to as the [[gram atomic mass]] or [[molar mass]].
   11: A similar definition applies to [[molecule]]s; it is then call...
9. Sword (24928 bytes)
   2: ...d periods as a result of the differences in blade design and purpose. The names given to many swords i...
   10: ...[[Bronze Age sword]]s with typical leaf-shaped blades first appear near the [[Mediterranean]] and the ...
   14: ... swords were not comparable to later [[steel]] blades; being brittle, they were even inferior to good ...
   16: ... Persia.jpg|left|thumb|150px|A decorative sword made of [[gold]] in [[7th century]] [[Iran|Iran (Persi...
   18: ...[[pattern welding]]. Over time, different methods developed all over the world.
10. Americium (6956 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    5: {| align="center" border="0"
    20: | [[Chemical series]] || [[actinide]]s
    37: | [[van der Waals radius]] || no data
    45: | [[Oxidation state]]s ([[Oxide]]) || 6,5,4,'''3''' ([[amphoteric]])
11. Berkelium (5697 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    5: {| align="center" border="0"
    21: | [[Actinide]]s
    41: | [[Density]]
    47: {| border="1" cellspacing="0" cellpadding="2" width="100%"
12. Boron (9084 bytes)
    1: {{Elementbox_header | number=5 | symbol=B | name=boron | left=[[bery...
    10: {{Elementbox_density_gpcm3nrt | 2.34 }}
    11: {{Elementbox_densityliq_gpcm3mp | 2.08 }}
    20: ...ementbox_oxistates | 3<br />(mildly [[acid]]ic oxide) }}
    40: ...3% in natural samples. Boron-11 is<br />the remainder in such cases.</small>
13. Caesium (11026 bytes)
    1: ...of data; skip past it to edit the text. -->{| border="1" cellpadding="2" cellspacing="0" align="right...
    3: {| align="center" border="0"
    22: | [[Density]], [[Mohs hardness scale|Hardness]]
    23: | 1879 [[kilogram per cubic metre|kg/m³]], 0.2
    39: | [[van der Waals radius]]
14. Curium (8593 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    4: {| align="center" border="0"
    20: | [[actinide]]s
    39: | [[van der Waals radius]]
    48: | [[Oxidation state]]s ([[Oxide]])
15. Germanium (8776 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    5: {| align="center" border="0"
    26: | [[Density]], [[Mohs hardness scale|Hardness]]
    27: | 5323 [[kilogram per cubic metre|kg/m³]], 6
    43: | [[van der Waals radius]]
16. Gold (24329 bytes)
    4: {| border="1" cellpadding="2" cellspacing="0" align="right...
    6: {| align="center" border="0"
    26: | [[Density]], [[Mohs hardness scale|Hardness]]
    27: | 19300 [[kilogram per cubic metre|kg/m³]], 2.5
    43: | [[van der Waals radius]]
17. Hafnium (9162 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    4: {| align="center" border="0"
    23: | [[Density]], [[Mohs hardness scale|Hardness]]
    24: | 13310 [[kilogram per cubic metre|kg/m³]], 5.5
    32: | 178.49 [[gram|g]]/[[mole (unit)|mol]]
18. Helium (36603 bytes)
    2: {| width="250" border="1" cellpadding="2" cellspacing="0" align="right...
    4: {| align="center" border="0"
    26: | [[Density]]
    27: | 0.1785 [[gram|g]]/[[litre|L]]
    35: | 0.95 [[Kelvin|K]] (-272.2 &deg;[[Celsius|C]])
19. Indium (8657 bytes)
    2: {| border="1" cellpadding="2" cellspacing="0" align="right...
    4: {| align="center" border="0"
    24: | [[Density]], [[Mohs hardness scale|Hardness]]
    25: | 7310 [[kilogram per cubic metre|kg/m³]], 1.2
    41: | [[van der Waals radius]]
20. Iodine (11416 bytes)
    1: ...of data; skip past it to edit the text. -->{| border="0" align="right" style="margin-left:0.5em"
    3: {| border="1" cellpadding="2" cellspacing="0" align="right...
    5: {| align="center" border="0"
    25: | [[Density]], [[Mohs hardness scale|Hardness]]
    26: | 4940 [[kilogram per cubic metre|kg/m³]], no data

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