CPC Unit 4 and 5 Sem Exam Review

Front

What is the electron configuration of the most chemically stable atom?

Back

[Ne]3s²3p⁶

Front

What is the energy change when a stable ionic compound is formed from ions?

Back

The formation is always exothermic.

Front

Why was Mendeleev's periodic table widely accepted?

Back

He predicted the existence and properties of undiscovered elements.

Front

How many chloride (Cl⁻) ions are present in a formula unit of magnesium chloride (MgCl₂)?

Back

Two

Front

How many electrons does Zinc need to lose to achieve pseudo-noble gas formation?

Back

2

Front

What is the significance of the octet rule in chemistry?

Back

Atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.

Front

Define ionic bond.

Back

An ionic bond is a chemical bond formed between two ions with opposite charges.

Front

What is the role of valence electrons in chemical bonding?

Back

Valence electrons are involved in forming bonds between atoms.

Front

What is the periodic law?

Back

The periodic law states that the properties of elements are a periodic function of their atomic numbers.

Front

What is a pseudo-noble gas configuration?

Back

A pseudo-noble gas configuration is a stable electron arrangement that resembles that of noble gases but has fewer than eight valence electrons.