Answer :
Final answer:
The elements Ni (Nickel), Ne (Neon), Mg (Magnesium), and Si (Silicon) are classified as a metal, a noble gas, a metal, and a metalloid respectively.
Explanation:
The correct classification of the elements Ni, Ne, Mg, and Si, in order, would be option 3) which is metal, noble gas, metal, and metalloid respectively. Ni (Nickel) is a transition metal, Ne (Neon) is a noble gas, Mg (Magnesium) is a main-group (representative) metal, and Si (Silicon) is a metalloid. Classifying elements into these categories: metal, nonmetal, and metalloid is done based on their chemical properties, like valency and electrical conductivity, as well as their position on the Periodic Table.
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