百度试题 结果1 题目6 An atom of element Q contains 19 electrons, 19 protons and 20 neutrons.What is Q? B A calcium B potassium C strontium D yttrium 相关知识点: 试题来源: 解析 B 反馈 收藏
The scientific study of matter's characteristics and behaviour is known as chemistry.andare different from the normal vocabulary. It is a branch of natural science that examines the building blocks of matter, including the atoms, molecules, and ions that make up compounds and their composition, s...
Nucleosynthesis is the creation of new atomic nuclei, the centers of atoms that are made up of protons and neutrons. Nucleosynthesis first occurred within a few minutes of theBig Bang. At that time, a quark-gluonplasma, a soup of particles known asquarks and gluons, condensed into protons an...
What is the element corresponds to the electronic configuration below: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^{10} 5s^2 A) Calcium B) Mercury C) Lead D) Cadmium What is the name and symbol of the element that has an atomic number of 11 and 12 neutrons? How many...
Nuclear Chemistry: Nuclear chemistry is the part of chemistry that does research on the activity in the nucleus of an atom and radioactive isotopes. Radioactive isotopes emit radiation to become more stable. Answer and Explanation:1 The belt of stability in nuclear chemistry is the narrow region...
What is the orbital diagram for calcium? How many d orbitals are in the d sublevel? How many atoms of neon are present in 1.30 moles of neon? What is the noble gas notation of sulfur (S)? What is the chemical element neon?
Now you need to turn the uranium hexafluoride gas back into uranium metal. You do this by adding calcium. The calcium reacts with the fluoride to create a salt, and the pure uranium metal is left behind. With this highly concentrated U-235 metal, you can either make anuclear bombor powe...
electrons carries a net positive charge and is called a cation. An ion with more electrons than protons carries a net negative charge and is called an anion. The number of neutrons doesn't come into play since they are electrically neutral. Changing the number of neutrons determines the ...
The structure of a substance is a key identification factor. You can distinguish salt from sand in a microscope because of their structural... Learn more about this topic: How Atoms & Molecules Form Solids: Patterns & Crystals from Chapter 2/ Lesson 5 ...
Ca - Calcium Element Symbols and Numbers The number of the element is its atomic number, which is the number of protons in each atom of that element. The element symbol is a one- or two-letter abbreviation of the element's name. Sometimes it refers to an old name. (For instance, K ...