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In short, a nucleus that is made up of protons and neutrons which is surrounded by rings of electrons.
More in depth:
A nucleus that contains protons and neutrons which is surrounded by rings of orbiting electrons. The protons have a relative charge* of +1, neutrons a relative charge of 0 and electrons a relative charge of -1. Therefore the nucleus is positively charged and the electrons are negatively charged.
The nucleus of the atom has a much larger mass than the electrons (protons and neutrons have a relative mass number of 1 and electrons a relative mass number of 0.0005).
The electrons arrange themselves around the nucleus in 'energy shells' or rings around the nucleus. Two electrons can fit on the first ring, then eight etc etc.
The electron 'cloud' is so far away from the nucleus that 99.9999999999999% of the atom is just empty space. If you were to stand on the white cliffs of Dover as if you were a nucleus, the distant edges of France in the distance would be the electrons! Everything single thing in the universe is made up of atoms, including ourselves, which makes everything around 99% space as well! Looking at your hand, you wouldn't think that it was predominantly empty, but it is!
There are many different forces at work that keep the atom together. The Electrostatic Force of attraction holds the electrons in the atom because a proton (positively charged) will attract an electron (negatively charged).
However, this force also acts between protons and other protons which means surely that the nucleus would blow itself apart because the protons would all repel each other? The answer is no because there is another force at work; the Strong Nuclear Force which over comes the electrostatic forces of repulsion to keep the atom together!
* When we say relative we mean divided by the mass or charge of a proton. For example, the charge of a proton is 1.60 * 10^-19 so we give it a charge of 1 (1.60 * 10^-19 / 1.60 * 10^-19). Electrons have a mass of 9.11 * 10^-31 so we divide this by the mass of a proton (1.67 * 10^-27) to get 0.0005. This is basically used to make the numbers easier to visualise/ work with.
Hope this helps :)
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoAccording to modern model of atom, electrons revolving around the nucleus does not radiate energy continuously. Because the spectra recorded of an atom was found to be line spectra or discontinuous spectra.
Wiki User
∙ 13y agoTo my knowledge, the modern model is the electron cloud atom. It states that Electrons travel in a cloud randomly rather than in orbits. They are more likely to be closer to the atom than further away from it, so the outer edges of the cloud are a lighter color that the center of the cloud. The electrons could be just about anywhere, though.
Wiki User
∙ 13y agothe modern atomic model is composed of a nucleus in which the protons and neutrons are located, and is also surrounded by an electron cloud in which the energy levels that the electrons are on is located on the outside of the nucleus
Wiki User
∙ 12y agoenergy of the orbit is related to its size. The lowest energy is found in the smallest orbit.
Wiki User
∙ 7y agoThe modern atom is explained by quantum mechanics.
Wiki User
∙ 12y agoThe quantum mechanical model.
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What couldn't Rutherford model explain?
The Rutherford model of atom has neither addressed the process of radiation of atoms nor could it explain the stability of the atom in spite of the revolving electrons around the nucleus. According to electrodynamics the electron should radiate electromagnetic waves. A simple calculation shows that an electron starting from a circular orbit of the size of an atom will spiral into the nucleus by radiating away its energy in a very short time, about 10-8 s. This makes stability of the atom impossible, which is not the case.
What is the difference between the lock and key model versus the induced fit model of the enzyme substrate complex?
The lock and key model means that the substrate must perfectly fit the enzyme, and the enzyme does not change. The induced fit model is different as when the substrate fits together with the enzyme, the enzyme itself will change to either join substrates together or break a substrate down.
Why do the key features of the periodic table relate to the results of titration?
You don't need the periodic table for titrations (manual or potentiometric).
What colors are used in the 3 color process?
Cyan, Magenta, and Yellow. The more modern and common CMYK model includes a fourth colour K, meaning Key. The addition of the fourth colour, black, allows for better looking shadows and and keeps black looking colours from being muddy.
How are molecules and atoms similar?
They're similar in that they're both representative particles. However, their key difference lies in the fact that an atom is an representative particle of an element, and a molecule is a representative particle of a molecular, or covalently bonded compound.
What modern theory pictures an electron as?
Perhaps seeing electron in movement gives better understanding how it looks:http://www.msnbc.msn.com/id/23336318/key words for search engines: Electron filmed in motion
What are the key features?
key features are from countries and lots more like what is important to them
What are the Key features of mushrooms and toadstools?
key features are lora chuth sucking,etc
What are the key features of a medieval village and a modern town?
there arnt many but one is a church make sure u have that or your teacher wont be happy.
What are the key features of the type of map you created?
The key features of the map you created are the lithosphere the minuet and the miniseries.
Evaluate the key features of language?
The key features of language are that it is communicative, arbitrary, structured, generative and dynamic.
What are key features of a sound level meter?
The key feature as the name implies is that it gives you a very accurate display of the sound levels around you, also depending on the model it can tell you how dangerous the sound around you is.
18 The model of the atom proposed by Greek philosophers appears similar to the model proposed centuries later by Dalton What was the key difference between the two models?
The Greeks knew you could split an atom via nuclear fission, and used philospohy and logic. Dalton used experimental plates to check for a nucleus and came up with his model experimentally.
What are key characteristics?
the main features means what is the usual features
What are the key features of a ceilidh?
A ceilidh has quite a number of various features. The most important and key features for these traditional gatherings are Gaelic folk music and dancing.
What is key in determining whether an atom will form a bond with another atom?
Valence electrons
Which part of atom is the key to electricity?
The electron.
