Question

the list identifies various properties of four elements. element 1 is a gas at room temperature. element 2 is a solid which conducts electricity. element 3 is a gas with an effective nuclear charge of +7. element 4 is malleable and can take the form of a shiny solid sheet. based on this list, which elements are metals?
o elements 1 and 4
o elements 1 and 3
o elements 2 and 3
o elements 2 and 4

Explanation:

Step1: Recall metal properties

Metals are typically solids (at room - temperature for most common ones), conduct electricity, and are malleable.

Step2: Analyze Element 1

Element 1 is a gas at room temperature. Gases are not metals as metals are usually solids at room temperature.

Step3: Analyze Element 2

Element 2 is a solid which conducts electricity. Conductivity is a key property of metals, so Element 2 is likely a metal.

Step4: Analyze Element 3

Element 3 is a gas with an effective nuclear charge of + 7. Gases are not metals, so Element 3 is not a metal.

Step5: Analyze Element 4

Element 4 is malleable and can take the form of a shiny solid sheet. Malleability and a shiny appearance (metallic luster) are properties of metals, so Element 4 is a metal.

Answer:

Elements 2 and 4