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Structure of Matter An atom The atomic number indicates the number of is an indivisible particle. protons. is chemically indivisible. electrons and protons together. is the smallest known particle. neutrons. The atomic nucleus was discovered The mass number by Ernest Rutherfound. is greater than the atomic number. by Democritus. indicates the number of neutrons. by Galileo Galilei. is twice as large as the AN. The mass of an atom The heaviest atom found in nature is is mainly located in the nucleus. radon (atomic number 86). is defined by the electrons. plutonium (atomic number 94). is defined by the nucleons. meitnerium (atomic number 109). Size atomic nucleus : atomic shell = fly : apple molecular bonding. fly : volleyball ionic bonding. fly : cathedral metal bonding. In the atomic nucleus there are The relative molecular mass of CO2 protons. is 32 units. electrons. is 36 units. neutrons. is 44 units. To the outside atoms are NO name for a chemicel bonding is 1 u equals negatively charged. 1,6710-27 kg. electrically neutral. 61023 particles. positively charged. appr. the mass of an H-atom. An electrically charged atom is called What does an electron look like? molecule. ball-shaped and bluish electric atom. depends on state of aggregation ion. impossible to tell