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WARM UP “Learn to enjoy the little things – there are so many of them.” 1. What does this quote mean to you? 2. How can you practice this in your everyday life? 3. How does this apply to Chemistry? Atomic Numbers Atomic Number • Number of protons (p+) – Determines identity of atom/element # of Electrons • Electrons (e-) in an atom – # of p+ = # of e- Mass Number • # of p+ + # of neutrons (n0) Atomic Symbols • Carbon: 6 p+, 8 n0, 6 e- Carbon-14 Isotopes • Atoms with a different number of n0 – Same atom/element, different mass • Radioactivity if too many n0 – Too many particles, some “thrown out” WRAP UP Protons Neutrons Electrons Atomic Number Neon 10 Titanium 22 Uranium 92 Mass Number 20 26 238 ANSWERS Protons Neutrons Electrons Atomic Number Mass Number Neon 10 10 10 10 20 Titanium 22 26 22 22 48 Uranium 92 146 92 92 238 WARM UP • If an atom has 19 p, how many e does it have? • If an atom has 11 p, 11 e, and 19 n, what is its mass? • How many p does an atom with 36 n and 29 e have? WRAP UP • Draw a model of an atom with 4 protons, 3 neutrons, and the correct number of electrons.