Periodic table — role?
Organizes elements by atomic structure
Neutrons: charge
No electric charge in nucleus
Substance formulas — purpose?
Represent element or compound composition
Protons: charge
Positively charged, in nucleus
Valence electrons
Determine chemical behavior
Atomic mass formula
Protons + neutrons
Relative atomic mass
Compared to carbon-12 scale
Simple substance
Made of one element only
Compound substance
Made from multiple elements
Teste seu conhecimento com 8 perguntas sobre Fundamentals of Chemistry.
1. Which statement correctly describes the mass number of an atom?
2. What is the primary purpose of the atomic number (Z) in the periodic table?
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