a period in which single block elements are present by definition.
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Explanation:
Period 1. The first period contains the least elements than any other, with only two, hydrogen and helium. They therefore do not follow the octet rule, but rather a duplet rule. Chemically, helium behaves like a noble gas, and thus is taken to be part of the group 18 elements.
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1 st period ....
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hope it helps you quickly mate
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