Answer: The correct answer is Option 2.
Explanation:
All the given elements are considered as metals because they all are solid at room temperature and solids are generally solid at room temperatures.
For a solid to change into liquid, it has to attain a minimum temperature known as melting point of that solid.
The melting point of the given elements are:
Silver (Ag) = 1235 K
Aluminium (Al) = 933.5 K
Calcium (Ca) = 1115 K
Nickel )Ni) = 1728 K
From the above melting points, the element which will turn into liquid below 1000 K will be aluminium.
Hence, the correct answer is Option 2.
The physical state of an element could either be solid, liquid, or gaseous. The element which becomes a liquid at 1000 K is;
Normally, at room temperature (20°C), Aluminium is a solid substance. However, it reaches its melting point when heated to 933.473 K. At this point, it no longer maintains its solid nature, but becomes a liquid.
Other points to note about this element are; Its atomic number of 13 and its density which is 2.73 g cm−3. All of these factors are the physical properties of aluminum.
Therefore, the element whose melting point is 1000 K is aluminum.
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