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Niels Bohr (1913). "On the Constitution of Atoms and Molecules, Part I" (PDF). Philosophical Magazine. 26 (151): 1–24. doi:10.1080/14786441308634955.

Winter, Mark. “Hydrogen: Historical Information.” Hydrogen»Historical Information [WebElements Periodic Table], www.webelements.com/hydrogen/history.html.

“Geography Blog.” Maps of England, the-geography.blogspot.tw/2016/11/maps-of-england.html.

“How Did Henry Cavendish Discover Hydrogen?” Reference, IAC Publishing, www.reference.com/science/did-henry-cavendish-discover-hydrogen-f3cd6142de2a41f1.

Studios, Andrew Rader. “HY-DRO-GEN.” Chemistry Basics, www.chem4kids.com/files/elements/001_speak.html.

“15 Fun Hydrogen Facts You Should Know.” Facts Legend, factslegend.org/15-fun-hydrogen-facts-you-will-enjoy/.

Kaye, Tim. “What Is the Oldest Thing on Planet Earth?” Quora, 10 May 2016, www.quora.com/What-is-the-oldest-thing-on-planet-earth.

Seevers, Julie. “6th-8th Science.” Pinterest, 13 Nov. 2016, www.pinterest.com/pin/33354853470409833/.

Bentor, Yinon. Chemical Element.com - Hydrogen. Oct. 8, 2017 <http://www.chemicalelements.com/elements/h.html>.

Lampton, Christopher. “What Are the Dangers of Hydrogen-Powered Vehicles?” Dangers of Hydrogen - Dangers of Hydrogen | HowStuffWorks, HowStuffWorks, 4 Sept. 2008, auto.howstuffworks.com/fuel-efficiency/alternative-fuels/hydrogen-vehicle-danger1.htm.

Imgur. “First Image Ever of a Hydrogen Atom's Electron Cloud.” Imgur, 25 May 2013, imgur.com/gallery/cVwIso2.

Blaszczak-Boxe, Agata. “Facts About Hydrogen.” LiveScience, Purch, 23 Jan. 2015, www.livescience.com/28466-hydrogen.html.

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Hydrogen combines with other elements, forming several compounds, including common ones such as water (H₂O), ammonia (NH₃), methane (CH₄), table sugar (C₁₂H₂₂O₁₁), hydrogen peroxide (H₂O₂) and hydrochloric acid (HCI).
(Livescience,2017)

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(Rubikhan, 2013)

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1. Hydrogen flames are nearly invisible. When hydrogen catches fire, the flames are so dim and hard to see that they're both hard to avoid.

2. In the presence of an oxidizer, hydrogen can catch fire, sometimes explosively, and it burns more easily than gasoline does. Ideally, no oxygen should be present in the liquid hydrogen tanks in a fuel cell vehicle, but trace amounts of air may contaminate the hydrogen supply. If hydrogen should escape, it will immediately encounter oxygen in the air.

3. Liquid hydrogen is cold because it's highly compressed liquid hydrogen is extremely cold. If it should escape from its tank and encounter with skin it can cause severe frostbite.
(Lampton, Christopher, 2017)

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Henry who found hydrogen showed that hydrogen was important in all water molecules after discovering that water was created when hydrogen burned in air.
Other Daily life use:
Sun: One of the elements that make sunburn brightly is hydrogen. While hydrogen burns easily on Earth, the burning hydrogen on the Sun and other stars is the result of nuclear reactions that rely on isotopes of hydrogen.

Welding: The process of a blowtorch to cut or welding to bring things together need gases that can burn very hot. In welding, electricity splits hydrogen molecules and when the atoms recombine, huge amounts of heat are released.

Plants and Sugars: Hydrogen is in all plants and living things in general. We all have water, but there are also sugars generated through plant photosynthesis. That's why animals eat plants. For the sugars and energy-filled compounds.

Rocket Fuel: Hydrogen in a rocket fuel release all the energy. The hydrogen is compressed into a liquid form (H₂) and placed into tanks. It is combined with liquid oxygen (O₂) to create the most efficient reaction and release of energy.
(Chem4Kids, 2014)

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Symbol: H
Group Number: 1
Atomic Number: 1
Atomic Mass: 1.00794 amu
Number of energy level: 1
Number of Protons/Electrons: 1
Number of Neutrons: 0
Classification: Non-metal
(Bentor, Yinon, 2017)

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Where is hydrogen found in the periodic table?

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Where is hydrogen found in the periodic table?

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Hydrogen is the first element in the periodic table. It is the simplest possible atom composed of one proton in the nucleus which is orbited by a single electron. Hydrogen is the lightest element and it's the most abundant element in the universe. It's placed in the top left hand corner on the periodic table.
(Ducksters, 2017) (Seevers, Julie 2005)

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Hydrogen is the only element that can exist without neutrons.
(Duksters, 2017)

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Scientist estimated that hydrogen makes up over 90 percent of all the atoms in the universe,
(Ducksters, 2017)

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When hydrogen is in its solid phase, which is also known as crystalline hydrogen or metallic hydrogen. Hydrogen has the lowest density of all solids that are present on earth.
(Baidya, Sankalan, 2016)

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When hydrogen is in its liquid phase, hydrogen has the lowest density of any liquid present on this planet.
(Baidya, Sankalan, 2016)

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About 10 percent of human body weight is made up of hydrogen. This is not in form of pure hydrogen but in form of water, fats and protein.
(Baidya, Sankalan, 2016)
(Kaye Tim, 2016)

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Henry Cavendish was the guy who found out the element hydrogen. He was doing an experiment in 1766, the chemically reacting zinc with hydrochloric acid. Although hydrogen was previously studied and observed by the other scientist. He received credit for identifying hydrogen as a unique chemical element.
(Reference, 2017) (WebElement, 2014)

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Hydrogen was first discovered at 1766 in London, England.
(Geography Blog) (WebElement, 2015)

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(Lakhtakia, Akhlesh, 1996)