Front

What are noble gases and why are they considered the most stable elements in the periodic table?

Back

Noble gases are a group of elements in Group 18 of the periodic table that have 8 valence electrons, making them chemically inert and stable.

Front

How many valence electrons does the element with the electron configuration [Ne] 3s² 3p⁵ have?

Back

The element has seven valence electrons.

Front

What is a characteristic that is NOT typical of metallic compounds?

Back

Solubility in water is not a characteristic of metallic compounds.

Front

List the elements in order of increasing electronegativity from left to right: Na, Mg, P, Cl.

Back

The correct order is Na → Mg → P → Cl.

Front

What element is represented by the electron configuration 1s² 2s² 2p²?

Back

The element is Carbon.

Front

What is the significance of valence electrons in determining the chemical properties of an element?

Back

Valence electrons determine how an element interacts with other elements, influencing its reactivity and the types of bonds it can form.

Front

Define electronegativity and its trend in the periodic table.

Back

Electronegativity is the ability of an atom to attract electrons in a chemical bond. It generally increases from left to right across a period and decreases down a group.

Front

What are the main characteristics of metallic compounds?

Back

Metallic compounds typically exhibit high electrical conductivity, malleability, ductility, and luster.

Front

Explain why noble gases are used in lighting applications.

Back

Noble gases are used in lighting because they are inert and do not react with other substances, allowing them to emit light without forming unwanted compounds.

Front

What is the electron configuration for the element with atomic number 7?

Back

The electron configuration for nitrogen (atomic number 7) is 1s² 2s² 2p³.