Atomic Structure Knowledge Questions and Answers

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Describe the basic structure of an atom. A positively charged nucleus containing protons and neutrons surrounded by negatively charged electrons. 2 Compare the size of an atom to the size of its n... ucleus. The nucleus is much smaller than the atom, with a radius less then 1/10,000 the radius of an atom. Most of the mass of the atom is concentrated in the nucleus. 3 Describe the arrangement of electrons in an atoms. Electrons are arranged at difference distances from the nucleus (different energy levels). 4 Explain how the arrangement of electrons in an atom may change. Electrons may absorb electromagnetic radiation and move to a higher energy level, or emit infrared radiation and move to a lower energy level. 5 Explain what is meant by the 'atomic number' of an atom The number of protons in an atom. All atoms of a particular element have the same atomic number. 6 Explain what is meant by the 'mass number' of an atom. The total number of protons and neutrons in an atom. 7 Explain what is meant by an 'isotope'. Isotopes are atoms of the same element but which have different numbers of neutrons. [Show More]

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