【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 warming gas in the atmosphere. These Green House Gases (GIIGs) along with...
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...
Which element in the 8th column of the periodic table has the largest radius? Which chemical element has the highest number of isotopes? Which of the following has the largest atomic radius? a. Li b. Cs+ c. F- Which atom has the larger atomic radius: Ta or V? Which of the fol...
(b) addition to the organic phase of a second extractant which can selectively retain the E2 element(s) in the organic phase during the next stage; (c) selective de-extraction of element(s) E1 from the organic phase with an aqueous solution able to withdraw the element(s) from the ...
What element has the chemical symbol K? What element(s) are more polarizable than oxygen? What are elements in chemistry? How to find the atomic number of elements? What is the symbol for an ion with a 12 charge, 36 electrons, and 46 neutrons? For each of...
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。
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。
What element has 6 valence shell electrons and 16 protons? Which element below has five valence electrons? a. Si b. Se c. S d. I e. Sb What is the lightest element having a half-filled p subshell in the valence shell? Which of these element...
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...
Choose the BEST answer to the following. Which of these three elements has the most mass? (a) Hydrogen. (b) Iron. (c) Uranium. (d) Same in each. Comparing Atomic Masses of Elements: The atomic mass of an element is diff...