Question

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the element krypton is a gas that shows almost no chemical activity. to find another element with similar properties, the student should look on the periodic table of the elements for an element
in the same group
in the same period
with the same net charge
with the same atomic mass

Explanation:

Krypton is a noble gas, and elements in the same group (vertical column) of the periodic table have similar chemical properties because they have the same number of valence electrons. Elements in the same period (horizontal row) have different properties as they fill different electron shells. Same net charge or atomic mass doesn't determine similar chemical properties related to reactivity like noble gases. So to find an element with similar properties to krypton (low reactivity), we look for an element in the same group.

Answer:

in the same group