Give the name of the "lightest" element (has atoms of lowest mass) in group 1a.

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Patricky

Chemistry

14 October, 16:34

Give the name of the "lightest" element (has atoms of lowest mass) in group 1a.

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Cedric Evans · Answer 1

The periodic table of elements is ordered by atomic weight from the top left to the bottom right. Each column is assigned a group, they can be either A groups or B groups. To determine the lightest element in the 1A group, locate the 1A column, at look at the top most element. In this case, H, hydrogen.