A group of the periodic table is called

In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. ... Groups may also be identified using their topmost element, or have a specific name. For example, group 16 is also described as the "oxygen group" and as the "chalcogens".

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away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.