Chapter 2 Atoms Molecules Ions Pdf Atomic Nucleus Ion Molecules do not necessarily have to be compounds. h2 is two hydrogen atoms held together by a covalent bond. h2 is a molecule, but it is not a compound; h2 is a diatomic element. d. an anion is a negatively charged ion; e.g., cl−, o2−, and so 4 2− are all anions. a cation is a posively charged ion, e.g., na , fe3 , and nh 4 are all. Chapter 2: atoms, molecules, and ions (ch2 chang, chs 0 and 2 jespersen) atoms are the basic building blocks of matter. they are the smallest particles of an element that retain the chemical identity of the element, or, the basic unit of an.
Chapter 2 Atoms Molecules And Ions Millikan examined the motion of single tiny drops of oil that picked up static charge from ions in the air. he suspended the charged drops in air by applying an electric field and followed their motions through a microscope. it was suggested by marie curie. spontaneous emission of particles and or radiation. All atoms of a given element are identical, having the same size, mass and chemical properties. the atoms of one element are different from the atoms of all other elements. compounds are composed of atoms of more than one element. 1. by the early 1900s, two features of atoms had become clear: •they contain electrons, and they are electrically neutral. •to maintain electric neutrality, an atom must contain an equal number of positive and negative charges. 2. thomson proposed that an atom could be a positive sphere of matter in which. Each element is composed of extremely small particles called atoms. the atoms of one element are different from the atoms of all other elements. atoms cannot be changed, created or destroyed in chemical reactions. (as far as dalton knew, they couldn’t be changed at all). red o’s stay os and aqua n’s stay n’s.
Atoms Molecules And Ions Ap Chemistry Notes 1. by the early 1900s, two features of atoms had become clear: •they contain electrons, and they are electrically neutral. •to maintain electric neutrality, an atom must contain an equal number of positive and negative charges. 2. thomson proposed that an atom could be a positive sphere of matter in which. Each element is composed of extremely small particles called atoms. the atoms of one element are different from the atoms of all other elements. atoms cannot be changed, created or destroyed in chemical reactions. (as far as dalton knew, they couldn’t be changed at all). red o’s stay os and aqua n’s stay n’s. All atoms of a given element are identical (same mass, size, properties, etc.). the atoms of one element are different from the atoms of all other elements. even though they are different, some atoms of different elements may show similar properties. compounds are composed of atoms of more than one element. 1. when all the h ions are removed from the “ ic” acid, the anion’s name ends with “ ate.” 2. when all the h ions are removed from the “ ous” acid, the anion’s name ends with “ ite.” 3. the names of anions in which one or more but not all the hydrogen ions have been removed must indicate the number of h ions present. for. Atoms, molecules, and ions © 2015 pearson education, inc. the atomic mass unit (amu) • atoms have extremely small masses; the heaviest known atoms have a mass of only 4 × 10–22 g. • atomic mass unit (amu): – a convenient unit for expressing the masses of atoms and molecules. – by definition, 1 amu = 1 12 mass of a c 12 atom. Atoms, molecules, and ions writing formulas • because compounds are electrically neutral, one can determine the formula of a compound this way: the charge on the cation becomes the subscript on the anion. the charge on the anion becomes the subscript on the cation. if these subscripts are not in the lowest whole.
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