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Note: Atomic mass is a dimensionless quantity. Since the atomic number of sodium is 11, it has got 1 electron in the valence shell. Therefore, the valency of sodium is 1. The number of protons is equal to the number of electrons in sodium. But when s...
What is the main component of the atomic mass in English? A. Protons B. Electrons C. Neutrons D. Protons and neutrons 相关知识点: 试题来源: 解析 D。本题考查原子质量的主要组成部分。质子和中子的质量较大,是原子质量的主要构成部分,电子质量很小可忽略。选项 A 仅提到质子,不全面。选项 B 电子...
However, an atom with an L shell also contains a K shell. In fact, the L shell will start filling up after the K shell is filled. This means that an atom with an L shell can support up to 10 electrons because of the presence of both the K and L shells. For example, lithium and...
There are three different subatomic particles in an atom. The nucleus of an atom is composed of protons and neutrons, which are tightly packed together. Orbiting the nucleus, we find the tiny, negatively charged particles known as electrons....
A very simple atom model. It's not to scale but helpful for understanding how an atom is built. A core nucleus of protons and neutrons is surrounded by orbiting electrons. Every atom must have at least one proton in it. The number of protons in an atom is important, because it defines...
What is the velocity of an electron that has a momentum of 3.04×10−21 kg⋅m/s? Electron as a Wave: The electron was discovered by J.J. Thomson in 1897. It was thought to be a particle whizzing around the nucleus. But George, son of Thomson, experimented wi...
graphene is incredibly flexible, akin to plastic wrap.And because of its atomic structure, graphene is also an outstanding heat conductor.Electrons speed through this material much faster than they can through other materials.It’s been a few decades since graphene was first identified as a potenti...
Chapter 4 - Electrons. Properties of Light What is light? A form of electromagnetic radiation: energy that exhibits wavelike behavior as it travels through. 1 Electronic Structure of Atoms Chapter 6 2 The Wave Nature of Light All waves have a characteristic wavelength,, and amplitude, A. The...
How many valence electrons does lithium have? What element is fluorine? What is a polar covalent molecule? What is the orbital notation for lithium? Why is fluorine special in terms of electronegativity? Why is the electronegativity of an element important?