Ch.2 PPT - The Nature of Molecules Chapter 2 Atomic...

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1 The Nature of Molecules Chapter 2 2 Atomic Structure All matter is composed of atoms . Understanding the structure of atoms is critical to understanding the nature of biological molecules.
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2 3 Atomic Structure Atoms are composed of - protons – positively charged particles - neutrons – neutral particles - electrons – negatively charged particles Protons and neutrons are located in the nucleus . Electrons are found in orbitals surrounding the nucleus. 4 Atomic Structure
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3 5 Atomic Structure Every different atom has a characteristic number of protons in the nucleus. atomic number = number of protons Atoms with the same atomic number have the same chemical properties and belong to the same element . 6 Atomic Structure Each proton and neutron has a mass of approximately 1 dalton. The sum of protons and neutrons is the atom’s atomic mass . Isotopes – atoms of the same element that have different atomic mass numbers due to different numbers of neutrons.
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4 7 Atomic Structure 8 Atomic Structure Neutral atoms have the same number of protons and electrons. Ions are charged atoms. - cations – have more protons than electrons and are positively charged - anions – have more electrons than protons and are negatively charged
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9 Atomic Structure Electrons are located in orbitals surrounding the nucleus. Each orbital can contain only 2 electrons. Electrons possess potential energy, with
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Ch.2 PPT - The Nature of Molecules Chapter 2 Atomic...

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