![]() ![]() Valence electrons are important, as it determines whether there will be a reaction between particular elements and if yes, what products will be formed as a result. Chemical reactions occur when atoms’ gain or lose electrons- this will be explained in the next topic. The number of electrons in an atom’s outer shell are called valence electrons. This electronic configuration can be written as 2,8,1. In a sodium atom, there are two electrons in the first shell, eight electrons in the second and one in the third. ![]() The arrangement of the electrons in shells is called the electronic structure or electronic configuration. All of the following shells can hold a maximum of eight electrons. The first shell is nearest to the nucleus and can only contain a maximum of two electrons. ![]() Describe the build-up of electrons in ‘shells’ and understand the significance of the noble gas electronic structures and of valency electrons.Protons, neutrons and electrons are called subatomic particles because they make up any atom. Each shell contain a certain level of electrons depending on the element. Outside, the nucleus, particles called electrons around electron shells/energy levels (the ‘orbits’ on which they whiz around). Protons and neutrons are collectively called nucleons. The nucleus is made up of protons and neutrons. But what’s inside these atoms? Let’s take a look.Īt the centre of the atom is the nucleus. We’ve learned that all substances in the world are made up of atoms. Describe the structure of an atom in terms of electrons and a nucleus containing protons and neutrons.We apologise for the inconvenience, but hope that the new images will provide you with an even better learning experience. Disclaimer: Due to unforeseen difficulties, we have had to take down the images on this notes page. ![]()
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