Section 6.3 lecture for Honors Chem

1. Bellwork- Excited? 1s 2 2s 2 2p 6 3s 2 3p 5 4s 2 3d 10 4p 4 What element is this? Does this electron configuration represent an atom in an excited state or in its ground state? Explain.

2. Bellwork- Excited? 1s 2 2s 2 2p 6 3s 2 3p 5 4s 2 3d 10 4p 4 What element is this? As Does this electron configuration represent an atom in an excited state or in its ground state? Explain.

3. Bellwork- Excited? 1s 2 2s 2 2p 6 3s 2 3p 5 4s 2 3d 10 4p 4 What element is this? As Does this electron configuration represent an atom in an excited state or in its ground state? Explain. This As atom is in an excited state; One of the four electrons in the 4p sublevel could relax because a lower energy 3p orbital is unfilled.

4. Lecture 6.3- Periodic Trends

10. A neutral atom contains an equal number of protons and electrons. When an atom gains or loses electrons it is no longer neutral. It becomes a charged ion. An ion has a charge.

11. If an atom or a compound becomes charged it is called an ion

12. A positive ion is called a cation A negative ion is called an anion Positive + Positive + Positive +

13. Anakin NEGATIVE

14. When an atom gains an electron it gains an additional negative charge. A Chlorine atom will gain one electron to become a Chlorine anion. Cl e - _

15. An Oxygen atom will gain two electrons making an Oxygen ion with a charge of negative two. O e - e - _ 2-

16. Atoms of elements from the left side of the periodic table will lose electrons. When an atom loses an electron it has more protons than electrons, so it is a positively charged ion.

17. Sodium will lose one electron to create a sodium ion with a “plus one” charge Na e - +

18. A Magnesium atom will lose two electrons to form an ion with a charge of positive two. Mg e - + e - 2+