Question

Which one of the following is an example of an element ? A) concrete B) salt C) steel D) iron

Answer 1

Iron (D) is an element, as it is a pure substance consisting of one type of atom and cannot be broken down by chemical means. Other options are mixtures and compounds, not elements.

Step-by-step explanation:

Among the options provided, iron (D) is an example of an element. An element is a pure chemical substance consisting of one type of atom, which cannot be broken down into simpler substances by ordinary chemical means. Elements such as hydrogen, oxygen, carbon, nitrogen, sodium, chlorine, and iron are fundamental substances from which all matter is made. Other options like concrete, salt, and steel represent a heterogeneous mixture, a compound containing 2 elements, and a metal alloy, respectively. Iron, represented by the chemical symbol Fe on the periodic table, is known for being shiny, malleable, ductile, and a good conductor of electricity and heat, which are typical properties of metals.

Answer 2

Among the given options, iron (D) is the correct example of an element as it cannot be broken down into simpler substances and exhibits typical metallic properties.

Step-by-step explanation:

An element is a chemical substance that cannot be broken down into simpler substances by ordinary chemical means. Among the options provided, iron is an example of an element. Iron is a metal that is solid at room temperature, shiny, and conducts electricity and heat well, which fits the characteristics of metals. Options A) concrete is a heterogeneous mixture, B) salt is a compound containing 2 elements (sodium and chlorine), and C) steel is a metal alloy that consists of iron mixed with other elements. Therefore, the correct answer is D) iron, which corresponds to 'D. an element' in Column B.