Atomic Structure I Railway 2024 I RRB ALP RPF, NTPC Group DI Chemistry Pushpendra Sir #rpf
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Atomic structure is the arrangement of electrons and other particles in an atom:
Nucleus
The nucleus is the center of an atom and contains protons and neutrons. It's very small, but contains more than 99.9% of the atom's mass.
Electrons
Electrons orbit the nucleus in a cloud of negative charge. The number of electrons in an atom determines its properties, such as its valence. The number of electrons in an atom is equal to the number of protons, making the atom electrically neutral.
Protons and neutrons
Protons and neutrons have roughly the same mass, which scientists call one atomic mass unit (amu) or one Dalton. Protons have a positive charge (+1), while neutrons are uncharged.
Atoms with the same atomic number behave similarly chemically and are classified as the same element. Each element has its own name and a one- or two-letter symbol.
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