Entrance Test Preparation - 2024

Entrance Test Preparation - 2024

• Neutral atom with one electron in the 3d subshell indicates it belongs to the 3rd period and has 7 electrons in the outermost shell.
• Maximum number of electrons in a shell can be calculated using the formula 2n², where n represents the principal quantum number.
• Orbitals sharing the same values of n + l will have similar energy levels, exemplified by 3d and 3d*.
• The Aufbau principle arranges subshells in order of increasing energy, following the n + l rule.
• The element with a valence shell electronic configuration of 3s² is magnesium (Mg).
• For electrons within different s-orbitals, only the principal quantum number changes while keeping other quantum numbers constant.
• An oxide where the element (X) has 50% mass of oxygen and a relative atomic mass of 32 leads to an empirical formula of MO.
• The decomposition of calcium carbonate that generates 2.24 dm³ of carbon dioxide corresponds to the decomposition of 1 mole of the reactant.
• The molecular formula for glucose is C₆H₁₂O₆, illustrating the percentage relationships of its constituent elements.
• The electron configuration [Ar] 4s² belongs to calcium (Ca).
• The splitting of spectral lines in a magnetic field is explained by the magnetic quantum number (m).
• The d-subshell has five possible shapes for its orbitals.
• An orbital can be conceptualized as a region where there is a high probability of finding an electron, or as a spread of charge rather than just a fixed energy level.
• Moving to higher shells results in increases in the size of shells, subshells, and orbitals, reflecting a greater spatial extent for electron distribution.