question The term nuclear shell model explains the stability of nuclei based on

Chemistry

The term "nuclear shell model" explains the stability of nuclei based on:

A. Shell structure of electrons
B. Orbitals of electrons
C. Sublevels of electrons
D. Energy levels of electrons

The nuclear shell model is based on the shell structure of nucleons.

Which molecule has a resonance structure due to the delocalization of electrons?

A. SO3
B. CH4
C. H2O
D. CO2

In ion chromatography, separation is based on differences in:

A. Ionic charge
B. Molecular weight
C. Density
D. Refractive index

In the periodic table, the lanthanides are located in which period?

A. Period 6
B. Period 4
C. Period 5
D. Period 7

Which of the following is a common property of acids?

A. Sour taste
B. Sweet taste
C. Slimy feel
D. None of the above

Which element is a metalloid with the chemical symbol Si?

A. Silicon
B. Sulfur
C. Sodium
D. Silver

Which of the following is a weak base?

A. NH₃ (Ammonia)
B. KOH (Potassium hydroxide)
C. NaOH (Sodium hydroxide)
D. Ca(OH)₂ (Calcium hydroxide)

What is the primary function of a reagent in analytical chemistry?

A. Reacting with the analyte to produce a product
B. Providing color to the solution
C. Acting as a solvent
D. Maintaining a constant temperature

The process of adding an acid or a base to a solution to adjust its pH is known as:

A. Titration
B. Neutralization
C. Precipitation
D. Oxidation

Which ion is responsible for the acidic nature of a solution?

A. H⁺ (Hydrogen ion)
B. OH⁻ (Hydroxide ion)
C. Cl⁻ (Chloride ion)
D. Na⁺ (Sodium ion)

Which analytical technique is suitable for analyzing the elemental composition of solid samples?

A. X-ray fluorescence (XRF)
B. Mass spectrometry (MS)
C. Nuclear magnetic resonance (NMR)
D. Gas chromatography (GC)