why does strontium burn red?
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The electrons "jump" from their ground state to a higher energy level. ... The color emitted by larger atoms is lower in energy than the light emitted by smaller atoms. So, for example, strontium (atomic number 38) produces a reddish color, while sodium (atomic number 11) produces a yellowish color.
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The accident occurred when the fourth reactor suffered a huge power increase. This led to the core of the reactor exploding. ... This caused the neutron moderator, made of graphite, to start to burn. The fire caused more radioactive fallout to be released, which was carried by the smoke of the fire into the environment.
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Zr and Hf exhibit similar properties due to lanthanoid contraction. Electrons present in f subshell didn't do good shielding due to which with the increasing atomic number or increasing effective nuclear charge size gets constricted and size of Halfenium and Zirconium becomes almost equal.
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Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide. This is a strongly exothermic reaction, and lot of heat is generated.
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The intense heat of the atomic explosion caused what are called nuclear shadows. The blast changed the colors of surfaces like steps, walls, and pavement because of the UV radiation that was emitted.
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Radius and Reactivity As atomic number increases, so does an atom's radius. The outermost electron is held less tightly and escapes more readily. Therefore, the alkali metal with the higher number is more chemically reactive. This makes francium the most reactive of the alkali metals.
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Radioactive materials that emit alpha and beta particles are most harmful when swallowed, inhaled, absorbed, or injected. Gamma rays are the most harmful external hazard. Beta particles can partially penetrate skin, causing “beta burns”. Alpha particles cannot penetrate intact skin.
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From a sunburn to an allergic reaction, there are many things that can cause your skin to become red or irritated. It may be because extra blood rushes to the skin's surface to fight off irritants and encourage healing. Your skin can also become red from exertion, such as after a heart-pounding exercise session.
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The red, brown, and yellow colors so prevalent in southern UT result from the presence of oxidized iron–that is iron that has undergone a chemical reaction upon exposure to air or oxygenated water. The iron oxides released from this process form a coating on the surface of the rock or rock grains containing the iron.
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Many of the alkali metals are used in fireworks: Lithium - Lithium is a metal that is used to impart a red color to fireworks. ... Sodium - Sodium imparts a gold or yellow color to fireworks, however, the color may be so bright that it masks less intense colors. Potassium - Potassium helps to oxidize firework mixtures.
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Alkaline earth metals react with halogens and (except for beryllium) with water and oxygen. Magnesium, being less reactive, reacts only at higher temperatures than the other alkaline earth metals. Radium is radioactive, so its chemical properties are difficult to study.
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Warmth or burning in both hands may be caused by a rare skin condition called palmar erythema. This condition also causes a splotchy red color on your palms, and sometimes even your fingers.
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So why do you sometimes go to bed with a burn and seemingly wake up with a tan? The explanation: The same type of ultraviolet radiation — UVB rays — that sets your skin on fire is also behind your bronzing. “What gave you the burn also gave you the tan,” Wasserman tells Yahoo Health.
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As the alkali metals have low ionization energies for removal of their single valence electron, they are powerful reducing agents – they cause electron gain in substances they react with. Compounds of d-block elements are frequently paramagnetic.
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Since dark side Force users don't have a connection to the crystals the same way Jedi do, they have to bend the crystal to their will, which results in the crystal bleeding, thus turning it red. A crystal manipulated by the dark side can healed, but instead of returning to its original color, it becomes white instead.
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The red color might be mainly due to ferric oxides occurring as thin coatings on the soil particles while the iron oxide occurs as hematite or as hydrous ferric oxide, the color is red and when it occurs in the hydrate form as limonite the soil gets a yellow color.
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The red comes from oxidized iron -in other words, rust. The soil and sandstone in PEI are iron rich, and when they are exposed to air, the iron oxidizes and assumes that red color.