
Period 1 elements in the periodic table include the two chemical elements: hydrogen (H) having the atomic number 1, and helium (He) having the atomic number 2. These elements are in the first row of the periodic table.
1 |
2 |
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3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
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11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
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19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
32 |
33 |
34 |
35 |
36 |
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37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
51 |
52 |
53 |
54 |
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55 |
56 |
72 |
73 |
74 |
75 |
76 |
77 |
78 |
79 |
80 |
81 |
82 |
83 |
84 |
85 |
86 |
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87 |
88 |
104 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
112 |
113 |
114 |
115 |
116 |
117 |
118 |
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57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
71 |
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89 |
90 |
91 |
92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
100 |
101 |
102 |
103 |
1 | – period 1 element |
FAQs on Period 1 Element
‣ What element is in group 18, period 1? The helium element is in group 18 (or group ⅧA), period 1 of the periodic table. |
‣ What element is in group one, period 1? The hydrogen element is in group one, period 1 of the periodic table. |
‣ What are the two elements of first period? The two elements of the first period are hydrogen (H) and helium (He). |
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