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Anonymous users2024-02-15The most abundant element in the earth's crust is oxygen w(o)=
2. The most abundant metallic element in the earth's crust is aluminum w(al) 3, the most abundant element in the atmosphere is nitrogen (n2) 78 4, the most abundant element in biological cells is oxygen w(o) 65 5, and the lightest element is hydrogen (h2).
6. The lightest metal element is lithium (Li).
7. The heaviest element is osmium (OS).
8. The hardest element is diamond (hardness is 10 degrees), and the softest minerals are talc and graphite (both hardness is 1 degree).
9. The hardest metal element is chromium (CR), and its hardness is close to 10 degrees.
10. The non-metallic element with the highest melting point is graphite (3650) 11, the metal element with the highest melting point is tungsten (W) (3410) 12, and the element with the lowest melting point is helium (
13. The metal element with the lowest melting point is mercury (
14. The best malleability of the metal element is gold, the mass of only 1g AU can be pumped into 4000m of fine gold wire, can also be pressed into 1 10 5mm thick gold foil.
15. The metal element with the best conductivity is silver, and the others are copper, gold, and aluminum.
16. The solid non-metallic element with the best conductivity is graphite.
17. The most reactive metallic element is cesium.
18. The most reactive non-metallic element is fluorine.
19. The element with the most isotopes is tin (there are 10 kinds)20、The most susceptible non-metallic element in the air is white phosphorus (ignition point 40)21、The element that forms the most compounds is carbon.
22. The most radioactive element is radium (Ra).
23. The nuclide with the least number of neutrons is Pygium.
24. The elements with the highest valence number are nitrogen, 1, 2, 3, 4, 5) 25, the elements with the highest valence ruthenium (Ru) and osmium (OS), which have 8 valences.
26. The most liquefiable non-metallic element is bromine (br2, liquid at room temperature and pressure)27 the strongest acid, perchloric acid.
28 The strongest alkali barium hydroxide.
29 The most poisonous plutonium reads [pu"Element serial number 94 atomic weight 242!The crystals of radioactive elements are light blue! Highly toxic! 100 million times more toxic than cyanide!
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Anonymous users2024-02-14The strongest inorganic acid: perchloric acid.
Magic acid is mixed acid, and it is stronger.
The most poisonous, plutonium.
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Anonymous users2024-02-13The strongest acids: nitric acid, hydrochloric acid, sulfuric acid, aqua regia).
The strongest minus: potassium hydroxide, sodium hydroxide, calcium hydroxide, and barium hydroxide are common.
The most toxic elements: thallium, arsenide.
The standard state refers to a state of standard pressure (usually one standard atmosphere), which indicates the temperature of the standard state. In fact, this sentence can be removed! >>>More
According to the equation for the magnesium oxide reaction produced by magnesium and oxygen under the condition of ignition; >>>More
C Because CO reduces CuO, HCl and NaHCO3 form H2O, and the volume of water reacts with NaOH to become smaller, and it is possible that CO2 or N2 is generated when CO restores CuO.
according to your configuration.
No A75 A55 is required for the motherboard, ASROCK A55M-HVS motherboard **359 >>>More
This is the most basic respect for a girl, which means that you have put her at ease, whether you love it or not, it depends on your heart. Look at this you are afraid that she will be hurt, I tell you, congratulations, your fate has arrived. A home is about respecting each other. Even this most basic desire.