If atoms were structured according to the plum pudding model, where it just contained a mixture of positive and negative charges, the alpha particles should just fly straight through. Instead, Rutherford, Geiger and Marsden found that the alpha particles kept getting deflected, sometimes by a ...
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] ...
Electrical cords are usually made with both conductors and insulators. Electricity flows through a conductor in the center of the cord. A layer of insulation surrounds the conductor and prevents the electricity from "leaking" out. Objects usually have equal numbers of positive and negative charges,...
Atoms are found joined together in independent particles called "molecules," as ions formed by the gain or loss of electrons from the atoms and as free atoms. Ions are held together in compounds by the attraction between the positive and the negative charges of cations and anions. 展开 ...
In these atoms, the positive and negative charges cancel each other out, leading to an atom with no net charge.Accounting for the sizes of protons, neutrons, and electrons, most of the volume of an atom—greater than 99 percent—is, in fact, empty space. With all this empty space, ...
atom's mass, while the electrons occupy the electron shells or energy levels surrounding the nucleus. The number of protons determines the atom's atomic number, defining its element. Atoms are electrically neutral, with the positive charge of the protons balancing the negative charge of the ...
We study the positive and negative ionization probabilities P+ and Pu2212 of atoms sputtered from C60 at energy Ec. As the atom leaves the target molecule, its atomic level progressively decouples from the target levels; this can be described by means of the Anderson Hamiltonian with time-...
the smallest particle of anelementthat has all the properties of the element. adj.,adjatom´ic.ƒThere are two main parts of an atom: thenucleusand theelectroncloud. The nucleus is made up ofprotons, which carry a positive electrical charge, and (except in hydrogen)neutrons, which contai...
Electrons carry a negative electric charge, and protons carry a positive charge. The attraction between them holds electrons in orbits. When atoms come together, they share electrons in their outer shells to form chemical bonds. This model of a carbon atom is split in half to show the inside...
apositive ions (cations)are drawn towards the negative electrode,where they receive electrons from the electron-rich cathode and neutral atoms or molecules are formed. 正面离子(正离子)被画往消极电极,他们从富有电子的负极接受电子和中立原子或者分子被形成。[translate]...