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
An element has an atomic number of 114 and an atomic mass of 285. How many protons, neutrons, and electrons does a neutral atom of this element have? The atomic number of an element gives the number of and in the atom while the mass number gives the total number of and. ...
What element has 4 protons 5 neutrons and 2 electrons? How many protons does nihonium have? What is the name of a proton acceptor in a reaction? How many protons does berkelium have? Calculate the net charge on a substance consisting of a combination of 7.0x10^13 protons and 4.4x10^13 ...
Remember, an isotope is a form of a chemical element that has the same number of protons in its atomic nucleus but a different number of neutrons. The most common isotope of helium on Earth is helium-4, which does not have any known or potential uses as an energy source. Helium-3, in...
What element is named after Dmitri Mendeleev? What are the rare earth metals on the periodic table? How many electrons does einsteinium have? Is francium a compound or element? What is the most abundant isotope of boron? Which isotope of lithium has 3 neutrons?
Atoms: Atoms are the purest form of matter. They consist of protons, neutrons, and electrons. The periodic table lists all of the different types of atoms that are known to exist and are known as elements. Answer and Explanation: An atom that has more protons than electrons is called a ...
The world's rarest precious metals — also the heaviest! Hassium might be twice as heavy as iridium and osmium. Element 164, eka-darmstadtium, may be even heavier.
Evenstarswith masses between 10 and 20 times that of the sun, reach a limit to the heavy elements they can forge (Green, Jones, 2015, pg 251), usually ending up with a core of almost pure iron. Even this heavy element isn't dense enough to prevent massive cores from further collapse...
Could another type of atom just happen to have 11 protons, 11 electrons and 12 neutrons ? No. The number of protons = the 'Atomic Number', which is sometimes referred to as 'Z', defines the type of atom, i.e. which element it is an atom of. ...
neutrons, it remains the same element but becomes an isotope of that element. Different isotopes are identified by appending M to the upper left corner of the abbreviation for that element. For example,14C is an isotope of carbon (Z = 6) that has eight neutrons rather than the usual six....