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Atoms and Living Things Interaction

Understand how atoms form the basis of all living organisms, including ion formation, covalent bonds, and compound structures. Explore elements, electrons, and energy levels in atoms. Discover the importance of ionic and covalent bonds in chemical reactions within living systems.

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Atoms and Living Things Interaction

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  1. KEY CONCEPTAll living things are based on atoms and their interactions.

  2. Section 2-1 Objectives • Explain the connection between living things and atoms of different elements. • Describe how ions are formed. • Define and give examples of covalent bonds.

  3. H O Living things consist of atoms of different elements. • An atom is the smallest basic unit of matter. • An element is one type of atom. • All known elements found on Periodic Table Hydrogen atom (H) Oxygen atom (O)

  4. Oxygen atom (O) outermost energy level: 6 electrons (-) Nucleus:8 protons (+)8 neutrons inner energy level: 2 electrons (-) • An atom has a nucleus and electrons. • The nucleus has protons (+) and neutrons (0). • Electrons (-) are in energy levels outside nucleus. • Play major role in ALL chemical bonds

  5. _ O H H + + • A compound is made of atoms of different elements bonded together. • water (H2O) • Other examples?

  6. A compound is made of atoms of different elements bonded together. • carbon dioxide (CO2)

  7. A compound is made of atoms of different elements bonded together. • many other carbon-based compounds in living things • C6H12O6

  8. gained electron Na loses anelectron to CI ionic bond Sodium atom (Na) Chlorine atom (CI) Sodium ion (Na+) Chloride ion (CI-) Ions form when atoms gain or lose electrons. • An ion is an atom that has gained or lost one or more electrons.(atom with a charge) • Positive (+) ions • Negative (-) ions

  9. Form between oppositely charged ions. • Table salt Na+ and Cl-

  10. covalent bonds Oxygen atom (O) Carbon atom (C) Oxygen atom (O) Carbon dioxide (CO2 ) Atoms share pairs of electrons in covalent bonds. • A covalent bond forms when atoms share a pair of electrons. • multiple covalent bonds

  11. Diatomic Covalent Bond H2

  12. Ionic vs. Covalent Review Covalent Bond Ionic Bond

  13. Quick Quiz Time  • Each question will be worth 2 points • You may NOT talk and/or communicate with a classmate • Scores will be collected and recorded at the end of the chapter

  14. 1. Which phrase best describes atoms? • Single-celled organism • Smallest basic units of matter • Parts of a nucleus • Positively charged particles

  15. 2. An ion is formed when an atom gains or loses • Protons • Neutrons • Bonds • Electrons

  16. 3. Atoms connected by covalent bonds • Transfer pairs of electrons • Share pairs of electrons • Transfer pairs of protons • Share pairs of protons

  17. End of Show

  18. The Nucleus: Crash Course Chemistry #1

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