Atomic Mass and Atomic Number Worksheet for students to complete with element data.

Let me work through this Atomic Mass and Atomic Number Worksheet step by step.

Key relationships:
- Atomic Number = Number of Protons = Number of Electrons (in a neutral atom)
- Atomic Mass ≈ Protons + Neutrons
- Neutrons = Atomic Mass - Atomic Number (Protons)

Let me go through each row:

1. Copper: Protons=29, Neutrons=35, Electrons=29
- Atomic Number = 29
- Symbol = Cu
- Atomic Mass = 29+35 = 64

2. Tin: Symbol=Sn, Neutrons=69, Electrons=50
- Atomic Number = 50 (equals electrons in neutral atom)
- Protons = 50
- Atomic Mass = 50+69 = 119

3. Row with I (Iodine): Symbol=I, Atomic Number=53, Atomic Mass=127
- Name = Iodine
- Protons = 53
- Neutrons = 127-53 = 74
- Electrons = 53

4. Uranium: Name=Uranium, Atomic Mass=238, Electrons=92
- Symbol = U
- Atomic Number = 92
- Protons = 92
- Neutrons = 238-92 = 146

5. Row with K (Potassium): Symbol=K, Protons=19, Neutrons=20
- Name = Potassium
- Atomic Number = 19
- Atomic Mass = 19+20 = 39
- Electrons = 19

6. Lithium: Name=Lithium, Atomic Mass=7, Protons=3
- Symbol = Li
- Atomic Number = 3
- Neutrons = 7-3 = 4
- Electrons = 3

7. Row with O (Oxygen): Symbol=O, Atomic Number=8, Neutrons=8
- Name = Oxygen
- Protons = 8
- Atomic Mass = 8+8 = 16
- Electrons = 8

8. Gold: Name=Gold, Atomic Number=79, Atomic Mass=197
- Symbol = Au
- Protons = 79
- Neutrons = 197-79 = 118
- Electrons = 79

9. Row with atomic number 16: Atomic Number=16, Atomic Mass=32, Protons=16
- Name = Sulfur
- Symbol = S
- Neutrons = 32-16 = 16
- Electrons = 16

10. Silver: Name=Silver, Atomic Number=47, Atomic Mass=108, Protons=47
- Symbol = Ag
- Neutrons = 108-47 = 61
- Electrons = 47

11. Chromium: Name=Chromium, Neutrons=28, Electrons=24
- Symbol = Cr
- Atomic Number = 24
- Protons = 24
- Atomic Mass = 24+28 = 52

12. Row with Co (Cobalt): Symbol=Co, Atomic Mass=59, Neutrons=32, Electrons=27
- Name = Cobalt
- Atomic Number = 27
- Protons = 27
- Check: 27+32 = 59 ✓

13. Row with Ni (Nickel): Symbol=Ni, Protons=28
- Name = Nickel
- Atomic Number = 28
- Atomic Mass = ? (need to look up or calculate - typically 59 for common isotope, but let me check... Actually Ni has various isotopes. The most common is Ni-58. But since we're not given neutrons or mass, we might need to leave it or use standard value. Looking at the pattern, probably 58 or 59. Let me think... Actually the worksheet seems to expect us to fill from periodic table. Standard atomic mass of Ni is about 58.69, so approximately 59. But wait, looking at the row above Co with mass 59, maybe Ni should be different. Let me just note what's missing: Atomic Number=28, Electrons=28, and we need Atomic Mass and Neutrons. Common isotope Ni-58 has 30 neutrons.)

Actually, looking more carefully at the worksheet, for Ni we have Protons=28 given. We need to find Atomic Number (=28), Electrons (=28), and either Atomic Mass or Neutrons. Since neither is given, we'd use the periodic table value. Standard atomic mass of Ni ≈ 58.69, so ~59. Neutrons = 59-28 = 31. Or using Ni-58: neutrons = 30.

Hmm, let me reconsider. The worksheet says "Use your Periodic Table on the Mar. 9th HW page." So students would look up values. For Ni, atomic mass is typically listed as 58.69 or rounded to 59. Let me go with 59 and neutrons = 31.

Wait, actually I should be more careful. Let me re-examine. For Ni row: Symbol=Ni, Protons=28. Missing: Name, Atomic Number, Atomic Mass, Neutrons, Electrons.
- Name = Nickel
- Atomic Number = 28
- Electrons = 28
- Atomic Mass ≈ 59 (from periodic table)
- Neutrons = 59-28 = 31

14. Zinc: Name=Zinc, Atomic Number=30, Neutrons=35
- Symbol = Zn
- Protons = 30
- Atomic Mass = 30+35 = 65
- Electrons = 30

15. Row with Al (Aluminum): Symbol=Al, Neutrons=14, Electrons=13
- Name = Aluminum
- Atomic Number = 13
- Protons = 13
- Atomic Mass = 13+14 = 27

16. Row with Hg (Mercury): Symbol=Hg, Atomic Number=80, Atomic Mass=201
- Name = Mercury
- Protons = 80
- Neutrons = 201-80 = 121
- Electrons = 80

17. Platinum: Name=Platinum, Atomic Mass=195
- Symbol = Pt
- Atomic Number = 78
- Protons = 78
- Neutrons = 195-78 = 117
- Electrons = 78

18. Row with Fe (Iron): Symbol=Fe, Atomic Mass=56, Neutrons=30
- Name = Iron
- Atomic Number = 56-30 = 26
- Protons = 26
- Electrons = 26

19. Row with H (Hydrogen): Symbol=H, Atomic Number=1, Atomic Mass=1
- Name = Hydrogen
- Protons = 1
- Neutrons = 1-1 = 0
- Electrons = 1

20. Row with He (Helium): Symbol=He, Atomic Number=2, Atomic Mass=4
- Name = Helium
- Protons = 2
- Neutrons = 4-2 = 2
- Electrons = 2

21. Row with atomic number 4: Atomic Number=4, Protons=4, Electrons=4
- Name = Beryllium
- Symbol = Be
- Atomic Mass = ? Need neutrons. Not given. From periodic table, Be atomic mass ≈ 9. So neutrons = 9-4 = 5.
- Actually wait, let me check - is atomic mass given? Looking at the row: blank, blank, 4, blank, 4, blank, 4. So Atomic Number=4, Protons=4, Electrons=4. Missing: Name, Symbol, Atomic Mass, Neutrons.
- Name = Beryllium, Symbol = Be
- Atomic Mass ≈ 9 (from periodic table)
- Neutrons = 9-4 = 5

22. Row with Mg (Magnesium): Symbol=Mg, Protons=12, Neutrons=12, Electrons=12
- Name = Magnesium
- Atomic Number = 12
- Atomic Mass = 12+12 = 24

23. Row with C (Carbon): Symbol=C, Atomic Number=6, Protons=6, Neutrons=6
- Name = Carbon
- Atomic Mass = 6+6 = 12
- Electrons = 6

24. Silicon: Name=Silicon, Atomic Number=14, Neutrons=14
- Symbol = Si
- Protons = 14
- Atomic Mass = 14+14 = 28
- Electrons = 14

25. Row with Cl (Chlorine): Symbol=Cl, Protons=17, Neutrons=18
- Name = Chlorine
- Atomic Number = 17
- Atomic Mass = 17+18 = 35
- Electrons = 17

26. Row with Bi (Bismuth): Symbol=Bi, Atomic Mass=209, Electrons=83
- Name = Bismuth
- Atomic Number = 83
- Protons = 83
- Neutrons = 209-83 = 126

27. Boron: Name=Boron, Atomic Number=5, Atomic Mass=11
- Symbol = B
- Protons = 5
- Neutrons = 11-5 = 6
- Electrons = 5

28. Row with Ca (Calcium): Symbol=Ca, Atomic Number=20, Electrons=20
- Name = Calcium
- Protons = 20
- Atomic Mass = ? Not given directly. From periodic table, Ca ≈ 40. Neutrons = 40-20 = 20.
- Actually, looking at the row: blank, Ca, 20, blank, blank, blank, 20. So we have Symbol=Ca, Atomic Number=20, Electrons=20. Missing: Name, Atomic Mass, Protons, Neutrons.
- Name = Calcium
- Protons = 20
- Atomic Mass ≈ 40 (from periodic table)
- Neutrons = 40-20 = 20

29. Row with atomic number 25: Atomic Number=25, Atomic Mass=55, Protons=25
- Name = Manganese
- Symbol = Mn
- Neutrons = 55-25 = 30
- Electrons = 25

30. Lead: Name=Lead, Atomic Mass=207, Electrons=82
- Symbol = Pb
- Atomic Number = 82
- Protons = 82
- Neutrons = 207-82 = 125

31. Sodium: Name=Sodium, Symbol=Na
- Atomic Number = 11
- Atomic Mass ≈ 23 (from periodic table)
- Protons = 11
- Neutrons = 23-11 = 12
- Electrons = 11

32. Fluorine: Name=Fluorine
- Symbol = F
- Atomic Number = 9
- Atomic Mass ≈ 19 (from periodic table)
- Protons = 9
- Neutrons = 19-9 = 10 (given as 10, checks out)
- Electrons = 9 (given as 9, checks out)

33. Row with P (Phosphorus): Symbol=P, Atomic Number=15, Atomic Mass=31
- Name = Phosphorus
- Protons = 15
- Neutrons = 31-15 = 16
- Electrons = 15

Let me verify my calculations once more and compile the final answer in a clear table format.