Write the missing chemical symbol in each box.

1
H
Hydrogen
1.0

  Atomic number
  Chemical symbol
  Chemical name
  Relative atomic mass

51


Antimony
121.8

52


Tellurium
127.6

53


Iodine
126.9

54


Xenon
131.3

55


Caesium
132.9

56


Barium
137.4

57


Lanthanum
138.9

58


Cerium
140.1

59


Praseodymium
140.9

60


Neodymium
144.2

61


Promethium
147.0

62


Samarium
150.4

63


Europium
152.0

64


Gadolinium
157.3

65


Terbium
158.9

66


Dysprosium
162.5

67


Holmium
164.9

68


Erbium
167.3

69


Thulium
168.9

70


Ytterbium
173.0

71


Lutetium
175.0

72


Hafnium
178.5

73


Tantalum
181.0

74


Tungsten
183.9

75


Rhenium
186.2

76


Osmium
190.2

77


Iridium
192.2

78


Platinum
195.1

79


Gold
197.0

80


Mercury
200.6

81


Thallium
204.4

82


Lead
207.2

83


Bismuth
209.0

84


Polonium
210.0

85


Astatine
210.0

86


Radon
222.0

87


Francium
223.0

88


Radium
226.0

89


Actinium
227.0

90


Thorium
232.0

91


Protactinium
231.0

92


Uranium
238.0

93


Neptunium
237.0

94


Plutonium
242.0

95


Americium
243.0

96


Curium
247.0

97


Berkelium
247.0

98


Californium
251.0

99


Einsteinium
254.0

100


Fermium
253.0

101


Mendelevium
256.0

102


Nobelium
254.0

103


Lawrencium
257.0

 Chemical Symbols

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