Describe the molecular geometry of:
(a) H₂Se

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Identify the central atom in the molecule. For H2Se, selenium (Se) is the central atom because hydrogen (H) is typically a terminal atom.

Determine the number of valence electrons for the central atom. Selenium (Se) is in group 16 of the periodic table, so it has 6 valence electrons.

Count the total number of valence electrons in the molecule. Each hydrogen atom contributes 1 valence electron, so H2Se has a total of 6 (from Se) + 2 (from 2 H atoms) = 8 valence electrons.

Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the molecular geometry. Selenium will form two single bonds with hydrogen atoms, using 4 of its valence electrons, leaving 2 lone pairs on the selenium atom.

Based on the VSEPR theory, the presence of two bonding pairs and two lone pairs around the central atom (Se) results in a bent or angular molecular geometry, similar to that of water (H2O).

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VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) Theory is a model used to predict the geometry of individual molecules based on the repulsion between electron pairs in the valence shell of the central atom. According to this theory, electron pairs will arrange themselves as far apart as possible to minimize repulsion, leading to specific molecular shapes.

Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule. It is determined by the number of bonding pairs and lone pairs of electrons around the central atom, which influences the overall shape, such as linear, bent, or tetrahedral. For H2Se, understanding its molecular geometry helps in predicting its physical and chemical properties.

Bond Angles

Bond angles are the angles formed between adjacent bonds in a molecule, which are influenced by the molecular geometry. In H2Se, the presence of lone pairs on the selenium atom affects the bond angles between the hydrogen atoms, leading to a bent shape. Understanding bond angles is crucial for predicting how molecules interact and behave in different chemical environments.

Describe the molecular geometry of:(a) H2Se