Chemistry Sem 1 Exam Review

Front

What is the electron configuration for Potassium (K)?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

Front

Define atomic mass.

Back

Average mass of all isotopes of an element.

Front

Who discovered the electron?

Back

J.J. Thomson.

Front

What is the formula for the ionic compound formed between magnesium and oxygen?

Back

MgO

Front

What is the correct name for the covalent compound PCl₅?

Back

Phosphorus pentachloride.

Front

What is the charge of a potassium ion (K⁺)?

Back

+1.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is the significance of the octet rule in chemistry?

Back

Atoms tend to bond in a way that gives them eight valence electrons, achieving a stable electron configuration.

Front

What is the formula for calculating the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.

Front

What is the role of valence electrons in chemical bonding?

Back

Valence electrons are involved in forming bonds between atoms.