1. Hydrogen

2. H

3. Helium

4. He

5. Lithium

6. Li

7. Beryllium

8. Be

9. Boron

10. B

11. Carbon

12. C

13. Nitrogen

14. N

15. Oxygen

16. O

17. Fluorine

18. F

19. Neon

20. Ne

21. Sodium

22. Na

23. Magnesium

24. Mg

25. Aluminum

26. Al

27. Silicon

28. Si

29. Phosphorus

30. P

31. Sulfur

32. S

33. Chlorine

34. Cl

35. Argon

36. Ar

37. Potassium

38. K

39. Calcium

40. Ca

41. Scandium

42. Sc

43. Titanium

44. Ti

45. Vanadium

46. V

47. Chromium

48. Cr

49. Manganese

50. Mn

51. Iron

52. Fe

53. Cobalt

54. Co

55. Nickel

56. Ni

57. Copper

58. Cu

59. Zinc

60. Zn

61. Gallium

62. Ga

63. Germanium

64. Ge

65. Arsenic

66. As

67. Selenium

68. Se

69. Bromine

70. Br

71. Krypton

72. Kr

73. Rubidium

74. Rb

75. Strontium

76. Sr

77. Yttrium

78. Y

79. Zirconium

80. Zr

81. Niobium

82. Nb

83. Molybdenum

84. Mo

85. Technetium

86. Tc

87. Ruthenium

88. Ru

89. Rhodium

90. Rh

91. Palladium

92. Pd

93. Silver

94. Ag

95. Cadmium

96. Cd

97. Indium

98. In

99. Tin

100. Sn

101. Antimony

102. Sb

103. Tellurium

104. Te

105. Iodine

106. I

107. Xenon

108. Xe

109. Cesium

110. Cs

111. Barium

112. Ba

113. Hafnium

114. Hf

115. Tantalum

116. Ta

117. Tungsten

118. W

119. Rhenium

120. Re

121. Osmium

122. Os

123. Iridium

124. Ir

125. Platinum

126. Pt

127. Gold

128. Au

129. Mercury

130. Hg

131. Thallium

132. Tl

133. Lead

134. Pb

135. Bismuth

136. Bi

137. Polonium

138. Po

139. Astatine

140. At

141. Radon

142. Rn

143. Francium

144. Fr

145. Radium

146. Ra

147. Uranium

148. U