Mar 29, 2017 · An atom is a particle of matter that characterizes a chemical element. It is the smallest part of ordinary matter. It is made from particles called protons, neutrons and electrons called the subatomic particles. An element is a substance that is made entirely of one type of atom. For example, the element sodium is made up of only sodium atoms.

May 31, 2018 · Too many neutrons in an atom will result in radioactive decay due to the neutrons' force overpowering the strong force. Electrons are the weirdest particles. They are the smallest ones, and have a mass of #1/1836# of a proton or a neutron. They are negatively-charged, and the valence electrons are responsible for the reactivity of an atom.

An atomic model is a theory trying to explain the structure of the atom. When the exact structure of the atom remained quite unknown, models were proposed based on experimental evidence of the properties of matter. Such models would be purely theoretical constructs. However, they should be able to explain the basic properties of matter.

Feb 21, 2016 · The electrons in an atom can only occupy certain allowed energy levels. When an electron drops from a higher energy level to a lower one, the excess energy is emitted as a photon of light, with its wavelength dependent on the change in electron energy. The electrons in an atom can only occupy certain allowed energy levels. This was one of the early results of …

Mar 21, 2014 · An atom becomes an Ion (a) if it gains one or more electron(s) or (b) if it loses one or more electron(s). When it gains electrons it becomes negatively charged and is called an anion. When it loses electron(s) it becomes positively charged and is called a cation.

Nov 13, 2015 · Proton (charge of +e, in the nucleus), Neutron (0 charge, in the nucleus), and Electron (charge of –e, outside the nucleus). 1. Proton. This is a positively charged particle that is present in the nucleus of atoms. It has a charge of + 1.6 × 10^(-19) C. But for ease we might say it has a charge of +e or +1. Neutron. This particle has a charge of zero; it is uncharged/neutral. It …

An isotope is a variant of an element in which it has an equal number or protons but a varied number of neutrons. The notation of an isotope occurs by adding a subscipt and superscript to the left side of an element such as 238 92U (uranium isotope)

Nov 29, 2015 · Atoms, ions and isotopes are very closely related. An atom is the smallest uncharged unit of a substance. This means a substance is made up of only that very type of particle throughout. For example, air is a mixture of gases. It contains atoms, or strictly speaking, molecules, of various gases, mostly nitrogen and oxygen with small amounts of other gases …

Mar 28, 2016 · Electrons in the Bohr model follow the number of elements in the rows of the periodic table. 2 in the first orbit 8 in the second and third ring 18 in the fourth etc... The Bohr model is a simplistic means of explains the placement of the subatomic particles of the elements of the periodic table. The Bohr model arrangement of electrons follows the same pattern as …

Mar 15, 2018 · Periodic trends predict differences between elemental characteristics as you move across the periodic table. Trends are based on Coulomb's law which mathematically relates several characteristics of an elements. Atomic size measured the distance between the nucleus of an atom and the outermost non-valence electrons of the atom. Atomic size decreases from left …