Unit 04 Post-Assessment Remediation (PAR)

Front

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

Back

A positive ion is formed with a smaller radius than the atom.

Front

Which element is malleable and a good conductor of electricity at STP?

Back

Platinum.

Front

What is the trend for electronegativity across a period in the periodic table?

Back

Electronegativity increases due to an increase in atomic number.

Front

Who predicted the existence of an unknown element X with an oxide formula X₂O₃?

Back

Dmitri Mendeleev.

Front

What distinguishes diamond from graphite in terms of their properties?

Back

They have different crystal structures.

Front

What is a positive ion?

Back

An atom that has lost one or more electrons, resulting in a net positive charge.

Front

Define electronegativity.

Back

The tendency of an atom to attract electrons in a chemical bond.

Front

What is the significance of Mendeleev's periodic table?

Back

It predicted the properties of undiscovered elements based on their position.

Front

How does atomic radius change when moving down a group in the periodic table?

Back

The atomic radius increases due to the addition of energy levels.

Front

What is the relationship between atomic number and electronegativity?

Back

Electronegativity generally increases with increasing atomic number across a period.