question How many electrons can occupy the third energy level n 3

Chemistry

How many electrons can occupy the third energy level (n = 3)?

A. 2
B. 8
C. 18
D. 32

The third energy level can hold a maximum of 18 electrons.

In a reversible process, the system and surroundings can be brought back to their initial state with:

A. No change in entropy
B. No change in temperature
C. No change in pressure
D. No net change in the universe

What is the IUPAC name for CH₃CH₂CH₂COOCH₃?

A. Methyl propanoate
B. Ethyl methanoate
C. Propyl ethanoate
D. Ethyl propanoate

In thermodynamics, "work" is considered positive when:

A. The system does work on the surroundings
B. The surroundings do work on the system
C. No work is done
D. The work is reversible

How many electrons are in the outermost energy level of an atom?

A. Valence electrons
B. 2
C. 8
D. 18

What is the pH range of acidic solutions?

A. 0 to 6
B. 7 to 14
C. 0 to 14
D. 8 to 14

The concept that energy levels of electrons in an atom are quantized is explained by:

A. Bohr's model
B. Schrödinger equation
C. Pauli exclusion principle
D. Hund's rule

The term "adiabatic wall" in thermodynamics refers to a boundary that allows:

A. Heat transfer
B. Volume change
C. Pressure change
D. No heat transfer

The nucleus of an atom contains:

A. Protons and electrons
B. Protons and neutrons
C. Electrons only
D. Neutrons only

What is the process by which an atom gains or loses electrons, resulting in an electric charge?

A. Ionization
B. Electron affinity
C. Electronegativity
D. Electron transfer

What is the common name for sodium hydroxide (NaOH)?

A. Caustic soda
B. Baking soda
C. Washing soda
D. Epsom salt