So, we can say that the number of protons present in an atom of He is two and the number of neutrons is 2. It can also be described as the number of neutrons of that atom added to the atomic number it gives its atomic mass number. It is the number of protons plus the number of neutrons of an atom. They have negligible mass as approximately 1800 electrons will equal to the mass of one proton. These are the primary carriers of electricity. ElectronsĮlectrons are the subatomic particles like protons and neutrons but located outside the nucleus and are negatively charged. These are the constituent of the nucleus of all atoms except for hydrogen. These have no net charge and have mass slightly more than that of protons. Neutrons are the subatomic particles present in atomic nuclei like protons. Note: Quarks are the fundamental constituent and elementary substance of matter that forms protons and neutrons. The number of protons present in the nucleus of an atom is called its atomic number. Every element has a unique number of protons in it, and this helps in defining the atomic number of an element. They have a charge equal to that of an electron in magnitude and mass of approximately one atomic mass unit. Protons are the positively charged subatomic particles present in the atomic nuclei. The atoms consist of protons, neutrons and electrons. A particular element is formed from only one type of atom i.e diamond is formed from carbon atoms only and gold is formed from gold atoms only. AtomsĪtoms are the smallest particle of an element that combine together to form molecules that form most of the objects in the universe. The mass number is measured by calculating the total number of neutrons and the number of protons in an atom. What is the relation of mass no with atomic no?.What is the difference between atomic mass number and relative atomic mass?.
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