Here are the chemical symbols, atomic numbers, and atomic masses of the first 50 elements:
Hydrogen (H) Atomic Number: 1 Atomic Mass: 1.008
Helium (He) Atomic Number: 2 Atomic Mass: 4.0026
Lithium (Li) Atomic Number: 3 Atomic Mass: 6.94
Beryllium (Be) Atomic Number: 4 Atomic Mass: 9.0122
Boron (B) Atomic Number: 5 Atomic Mass: 10.81
Carbon (C) Atomic Number: 6 Atomic Mass: 12.01
Nitrogen (N) Atomic Number: 7 Atomic Mass: 14.01
Oxygen (O) Atomic Number: 8 Atomic Mass: 16.00
Fluorine (F) Atomic Number: 9 Atomic Mass: 19.00
Neon (Ne) Atomic Number: 10 Atomic Mass: 20.18
Sodium (Na) Atomic Number: 11 Atomic Mass: 22.99
Magnesium (Mg) Atomic Number: 12 Atomic Mass: 24.31
Aluminum (Al) Atomic Number: 13 Atomic Mass: 26.98
Silicon (Si) Atomic Number: 14 Atomic Mass: 28.09
Phosphorus (P) Atomic Number: 15 Atomic Mass: 30.97
Sulfur (S) Atomic Number: 16 Atomic Mass: 32.07
Chlorine (Cl) Atomic Number: 17 Atomic Mass: 35.45
Argon (Ar) Atomic Number: 18 Atomic Mass: 39.95
Potassium (K) Atomic Number: 19 Atomic Mass: 39.10
Calcium (Ca) Atomic Number: 20 Atomic Mass: 40.08
Scandium (Sc) Atomic Number: 21 Atomic Mass: 44.96
Titanium (Ti) Atomic Number: 22 Atomic Mass: 47.87
Vanadium (V) Atomic Number: 23 Atomic Mass: 50.94
Chromium (Cr) Atomic Number: 24 Atomic Mass: 52.00
Manganese (Mn) Atomic Number: 25 Atomic Mass: 54.94
Iron (Fe) Atomic Number: 26 Atomic Mass: 55.85
Cobalt (Co) Atomic Number: 27 Atomic Mass: 58.93
Nickel (Ni) Atomic Number: 28 Atomic Mass: 58.69
Copper (Cu) Atomic Number: 29 Atomic Mass: 63.55
Zinc (Zn) Atomic Number: 30 Atomic Mass: 65.38
Gallium (Ga) Atomic Number: 31 Atomic Mass: 69.72
Germanium (Ge) Atomic Number: 32 Atomic Mass: 72.63
Arsenic (As) Atomic Number: 33 Atomic Mass: 74.92
Selenium (Se) Atomic Number: 34 Atomic Mass: 78.97
Bromine (Br) Atomic Number: 35 Atomic Mass: 79.90
Krypton (Kr) Atomic Number: 36 Atomic Mass: 83.80
Rubidium (Rb) Atomic Number: 37 Atomic Mass: 85.47
Strontium (Sr) Atomic Number: 38 Atomic Mass: 87.62
Yttrium (Y) Atomic Number: 39 Atomic Mass: 88.91
Zirconium (Zr) Atomic Number: 40 Atomic Mass: 91.22
Niobium (Nb) Atomic Number: 41 Atomic Mass: 92.91
Molybdenum (Mo) Atomic Number: 42 Atomic Mass: 95.95
Technetium (Tc) Atomic Number: 43 Atomic Mass: [98]
Ruthenium (Ru) Atomic Number: 44 Atomic Mass: 101.1
Rhodium (Rh) Atomic Number: 45 Atomic Mass: 102.9
Palladium (Pd) Atomic Number: 46 Atomic Mass: 106.4
Silver (Ag) Atomic Number: 47 Atomic Mass: 107.9
Cadmium (Cd) Atomic Number: 48 Atomic Mass: 112.4
Indium (In) Atomic Number: 49 Atomic Mass: 114.8
Tin (Sn) Atomic Number: 50 Atomic Mass: 118.7
Please note that atomic masses are approximate and may vary slightly due to isotopic variations.