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Calculating Neutrons Number of = Neutrons Atomic Mass – Atomic Number (Atomic Mass minus Atomic Number) Remember: When rounding numbers to the nearest whole number, you round UP if the number in the 10ths place is 5-9(like 1.6 would round up to 2) and you round DOWN if the number in the 10ths place is 0-4 (like 5.4 would round down to 5). 1. Helium (chemical symbol: He) a. Atomic Mass (rounded) = b. Atomic Number = Work: (Atomic Mass minus Atomic Number = Number of Neutrons) Number of Neutrons in Helium: 2. Phosphorus (chemical symbol: P) a. Atomic Mass (rounded) = b. Atomic Number = Work: (Atomic Mass minus Atomic Number = Number of Neutrons) Number of Neutrons in Phosphorus: 3. Neon (chemical symbol: Ne) a. Atomic Mass (rounded) = b. Atomic Number = Work: (Atomic Mass minus Atomic Number = Number of Neutrons) Number of Neutrons in Neon: 4. Carbon (chemical symbol: C) a. Atomic Mass (rounded) = b. Atomic Number = Work: (Atomic Mass minus Atomic Number = Number of Neutrons) Number of Neutrons in Carbon: 5. Lithium (chemical symbol: Li) a. Atomic Mass (rounded) = b. Atomic Number = Work: (Atomic Mass minus Atomic Number = Number of Neutrons) Number of Neutrons in Lithium: