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Iron. Iron is a chemical element; it has symbol Fe (from Latin ferrum 'iron') and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's outer and inner core.
Naturally occurring iron ( 26 Fe) consists of four stable isotopes: 5.845% of 54 Fe (possibly radioactive with a half-life over 4.4 × 1020 years), [ 4] 91.754% of 56 Fe, 2.119% of 57 Fe and 0.286% of 58 Fe. There are 24 known radioactive isotopes, the most stable of which are 60 Fe (half-life 2.6 million years) and 55 Fe (half-life 2.7 years).
The Fundamentals of Engineering ( FE) exam, also referred to as the Engineer in Training ( EIT) exam, and formerly in some states as the Engineering Intern ( EI) exam, is the first of two examinations that engineers must pass in order to be licensed as a Professional Engineer (PE) in the United States. The second exam is the Principles and ...
Iron(III) oxide in a vial. Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3.It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe 3 O 4), which also occurs naturally as the mineral magnetite.
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Genre (s) Tactical role-playing. Mode (s) Single-player, multiplayer. Fire Emblem: The Blazing Blade, [ a] also known simply as Fire Emblem, is a tactical role-playing game developed by Intelligent Systems and published by Nintendo for the Game Boy Advance handheld video game console. It is the seventh installment in the Fire Emblem series, [ b ...
The National Council of Examiners for Engineering and Surveying (NCEES) is an American non-profit organization dedicated to advancing professional licensure for engineers and surveyors. The Council’s members are the engineering and surveying licensure boards from all 50 U.S. states, the District of Columbia, Guam, Northern Mariana Islands ...
At atmospheric pressure, three allotropic forms of iron exist, depending on temperature: alpha iron (α-Fe, ferrite), gamma iron (γ-Fe, austenite), and delta iron (δ-Fe). At very high pressure, a fourth form exists, epsilon iron (ε-Fe, hexaferrum). Some controversial experimental evidence suggests the existence of a fifth high-pressure form ...