61. Concerning the electrons in the shells, such orbits of an atom, how many can have(a)n=4,l=2,m_e=1,andm_s=+1/2?(b)n=4,l=2,andm_e=1?(c)n=4andl=2?(d)n=4?(e)n=4,l=2,andm_s=+1/2? 相关知识点: 试题来源: 解析(a) 1个 (b) 2个 (c) 10个 (d) 32个 ...
To determine how many electrons are present in an atom with an atomic number of 20 and a mass number of 42, we can follow these steps:1. Understand the Atomic Number: The atomic number of an element is defined as the number of
Many amusement parks use hand stamps that are invisible until you view them under black light. In this article, we'll find out exactly what's going on here. We'll also see why black lights make some objects glow but not others, and we'll look at some interesting black light ...
Glare: This usually happens when lights aim directly into people's eyes; in other words, you see straight into the source of the light. Driving around at night, you've probably run across many lights emitting eye-scorching examples of glare (headlights are an excellent case in point). This...
Question: How many atoms are there in the Sun? The mass of the Sun is {eq}1.99\times {{10}^{30}}\text{ kg} {/eq}, and its composition (by mass) is approximately 70% hydrogen and 30% helium. Mass Percentage:...
In 1913, Bohr proposed that electrons exist in discrete orbits based on their energy. When an electron jumps from one orbit to a lower orbit, it gives off energy in the form of a photon. The quantum theory of light -- the idea that light exists as tiny packets, or particles, called ...
However we picture how electrons move around the atomic nucleus, whether in clean orbits or as a "cloud", we do know that they orbit in shells of increasingly higher energy, and each shell can incorporate up to a certain number of electrons. The lowest energy shell, which is closest to ...
2.2kg is equal to how many pounds?PoundA pound or symbol "lb", is a mass unit used in imperial and US customary measuring systems. The pound is descended from the Roman libra, and various meanings of the pound have been used throughout history previous to the new international avoirdup...
The Earth would merely orbit the black hole, just as it orbits the Sun now (The loss of sunlight would cause severe problems for life on Earth, however). Next, we'll look at how science fiction has handled lasers, sound and aliens. Lasers in Space Fire phasers! Image courtesy Axeman...
magnetism comes from the way that electrons in atoms orbit the nucleus. The orientation and strength of an atom's magnetic force is called a magnetic moment. For the past century, scientists have operated under the belief that there are two main classes of magnetism: ferromagnetism and ...