【题文】 Carbon is a chemical element which is present in organic compounds that make us organisms, plants as well as fossil. It is a vital component of the greenhouse gas CO2, the highest percentage of the global
Some chemical elements are named after countries. Which element is named after France? A. 中利认议任车亲下没重能全节属中利认议任车亲下没重能全节属Gallium中利认议任车亲下没重能全节属中利认议任车亲下没重能全节属 B. 装斯阶科近书正相斗战委装斯阶科近书正相斗战委Germanium装斯阶科近...
The organic electroluminescence chemical compound by this invention, luminous efficiency being good, is superior in life quality of the substance, depends, drive life can produce the very satisfactory OLED element.< Typical figure >It is notシン,ヒョ-ニム...
Atomic Number:Atomic number of the element is equal to the number of protons present in the nucleus of the element which is denoted by symbolZ. The superscript presents on the left side of thesymbol of the element. Atomic radius: Atomic radius is the d...
A chemical reaction changes the number of neutrons in a nitrogen atom. Which component in the atomic symbol for nitrogen shown below will change when this reaction occurs? A. N (element symbol) B. 14 (atomic mass) C. 7 (atomic number) An ion is ...
Chemical elements can be named after minerals. Which element is named after a mineral containing iron? A. Manganese B. Magnesium C. Mercury D. Molybdenum 相关知识点: 试题来源: 解析 A。锰(Manganese)是以一种含有铁的矿物命名的。镁(Magnesium)、汞(Mercury)、钼(Molybdenum)都不是以含有铁的矿...
Chemical elements can be named after planets. Which element is named after Uranus? A. Uranium B. Platinum C. Potassium D. Phosphorus 相关知识点: 试题来源: 解析 A。铀(Uranium)是以天王星(Uranus)命名的。铂(Platinum)、钾(Potassium)、磷(Phosphorus)都不是以行星命名。
The superscript presents on the left side of the symbol of the element . Atomic mass: It is generally expressed in terms of atomic mass unit ( amu ) which denotes the average number of protons and the neutrons present in the element considering the abundance...
Chloride of which of the following element is colored? A) Ag B) Hg C) Zn D) Co Colored Compounds Some of the insoluble compounds exhibit non-white colors which makes them easy to detect. It is for this reason that a particular test can be used to identify whether...
C) sun:正确。氦(Helium)源自希腊语“ἥλιος (helios)”,意为“太阳”,因其首次在太阳光谱中被观测到而得名。D) earth:错误。氦与地球无直接关联,且命名源于太阳。选项中的逗号可能是排版错误,但内容错误。结论:正确答案为C选项“sun”,符合氦的命名由来。