CHEMISTRY 161 Chapter 2.

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Presentation transcript:

CHEMISTRY 161 Chapter 2

Atomic Number and Mass Number (number of protons plus neutrons) atomic number (number of protons) (number of electrons)

Periodic Table of the Elements g r o u p

atom anion(Cl-) cation(Na+) ion (neutral) add electron(s) (reduction) take electron(s) (oxidation) anion(Cl-) (negative charge) cation(Na+) (positive charge) ion (charged)

-1 -2 -3 -/+4 -/+2 +3 +2 +1 +0

Reaction of potassium (K) with sulfur (S) / × 2 (1) K → K+ + e- (2) S + 2 e- → S-2 / × 1 (1) 2 K → 2 K+ + 2 e- (2) S + 2 e- → S-2 (1)+(2) 2K + S + 2e-→ K2S +2e- (1)+(2) 2 K + S→ K2S

problems, group 1 – 8 elements Homework Chapter 2, p. 43-61 problems, group 1 – 8 elements