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CHEM LESSON 3

CHEM LESSON 3. ATOMS AND ELEMENTS. DO-NOW. What are the three parts of an atom called?. Atoms and Elements. Each element consists of atoms that differ from the atoms of other elements. An element can be identified by the number of protons in the nucleus. . Atoms and Elements.

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CHEM LESSON 3

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  1. CHEM LESSON 3 ATOMS AND ELEMENTS

  2. DO-NOW • What are the three parts of an atom called?

  3. Atoms and Elements • Each element consists of atoms that differ from the atoms of other elements. • An element can be identified by the number of protons in the nucleus.

  4. Atoms and Elements • In the nucleus of the atom, the protons and neutrons are held together by a strong force

  5. Atoms and Elements • Every atom of an element as the same number of protons. We call this the atomic number. • For example, every atom of carbon has 6 protons

  6. Atoms and Elements • Atomic Number is the number of protons in the nucleus for each element. • Oxygen’s atomic number is 8, Iron’s atomic number is 26.

  7. Atoms and Elements • The Atomic Mass is the average mass of an atom for that specific element • Example: Oxygen’s atomic mass is 15.99 and Iron’s atomic mass is 55.847

  8. Atoms and Elements • Electrons are found in an electron cloud surrounding the nucleus.

  9. Atoms and Elements • Electrons are arranged on shells. Shells are the different energy levels on which electrons are found

  10. Atoms and Elements • The atomic mass, atomic number, and the chemical symbol are all organized into a square for each element on the periodic table.

  11. Atoms and Elements • Atomic Number • Chemical Symbol • Element • Atomic Mass

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