题目 Not only___ all the positive charges of an atom, it is also the site of the weight of every atom. () A.holds the nucleusB.the nucleus does holdC.does hold the nucleusD.does the nucleus hold 相关知识点: 试题来源: 解析 D 反馈 收藏 ...
a因为他锻炼我们的意志 Because he exercises our will [translate] aan atom or group of atoms that carries a positive or negative charge as a result of having lost or gain one or more electrons 运载一个正面或负电荷由于丢失的原子或小组原子或获取一个或更多电子 [translate] ...
and it is made up of protons and neutrons. The electrons in an atom fly around and above the nucleus in a cloud-like formation. The protons have a positive charge, and the electrons have a negative charge. In a normal or neutral atom, the...
Ernest Rutherford showed that all of the positive charges in an atom are concentrated within a very small volume, called the nucleus, and was awarded the 1908 Nobel Prize in Chemistry for the work. The nucleus has dimensions on the order of 10−15 m! This requires some new thinking: if...
An atom s formal charge is the difference between the number of valence electrons in an isolated atom and the number of electrons assigned to that atom in a Lewis structure.
By definition, atoms are neutral entities because the positive charge of the nucleus is cancelled by the negative charge of the electron cloud. However, the gain or loss of an electron can lead to the formation of an ion, also known as a charged atom.
Often, the number of protons and electrons is not the same, so the atom carries a net positive or negative charge. You can determine the number of electrons in anionif you know its charge. A cation carries a positive charge and has more protons than electrons. An anion carries a negative...
A PRECISE measure of the charge on an atom in a molecule is provided by calculating the number of electrons within a sphere of covalent radius using molecular wavefunctions. The results for alkyl substitution suggest that the simple qualitative ideas of the inductive effect may be less simple ...
The form of an atom is due to the electric charge of its parts. Each proton has one positive charge. Each electron has one negative charge. Each neutron is neutral or carries no electric charge. Like charges repel each other while opposite charges attract each other, so you might expect ...
Because a rearrangement to carbon-7 takes place, that carbon must have a positive charge during the course of the reaction. The oxygen is the only basic atom in the molecule, so protonation of the oxygen must be the first step. Sign in to download full-size image The protonated epoxide ...