Unit 4 Post Assessment Remediation (PAR)

Front

What is an active nonmetal element?

Back

An active nonmetal element is one that readily gains electrons to form negative ions. An example is oxygen.

Front

What happens to the charge and radius of an atom when it loses an electron?

Back

When an atom loses an electron, it forms a positive ion with a smaller radius than the original atom.

Front

How does the first ionization energy change in Group 2 elements from Be to Ba?

Back

The first ionization energy decreases, and the atomic radius increases as the atomic number increases from Be to Ba.

Front

Which noble gas has the same electron configuration as an oxide ion (O²⁻)?

Back

The noble gas with the same electron configuration as an oxide ion is neon.

Front

What causes diamond and graphite to have different properties?

Back

Diamond and graphite have different properties because they have different crystal structures.

Front

Define ionization energy.

Back

Ionization energy is the energy required to remove an electron from an atom or ion in its gaseous state.

Front

What is the relationship between atomic radius and ionization energy?

Back

Generally, as atomic radius increases, ionization energy decreases because the outer electrons are further from the nucleus and are less tightly held.

Front

What is the significance of crystal structure in determining the properties of materials?

Back

Crystal structure determines how atoms are arranged in a material, which affects its physical properties such as hardness, conductivity, and melting point.

Front

Explain the concept of electronegativity.

Back

Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond.

Front

What is the difference between a cation and an anion?

Back

A cation is a positively charged ion formed by the loss of one or more electrons, while an anion is a negatively charged ion formed by the gain of one or more electrons.