4.4. Draw the Lewis structures for the following molecules and ions:

H₂S, SiCl_4, BeF₂, CO₃^2-, HCOOH.   

<p><strong>4.4.&nbsp;</strong></p><p><strong><picture><img src="https://images.shiksha.com/mediadata/images/articles/1741769232php6d6rCb.jpeg" alt="" width="315" height="177"></picture></strong></p><p>The properties of molecules and compounds are determined by their molecular structure, which is the arrangement of the atoms in space. The molecular structure is determined by the type of bond and the number and arrangement of atoms in the molecule. The shape of the molecule affects its polarity, reactivity, and physical properties such as boiling point, melting point, and solubility.</p><p>The <strong>valence shell electron pair repulsion (VSEPR) theory</strong> is a model used to predict the molecular structure of covalent molecules based on the repulsion between valence electron&nbsp;pairs. This theory states that the electron pairs in the valence shell of an atom repel each other and try to occupy positions that minimise repulsion. The VSEPR theory is used to predict the geometry and shape of molecules, such as linear, trigonal planar, tetrahedral, and octahedral.</p><p>In summary, chemical bonding and molecular structure are important concepts in chemistry that help us understand the behaviour and properties of molecules and compounds. The type of bond and molecular structure determine the properties of a substance, including its reactivity, polarity, and physical properties. The VSEPR theory is a useful tool for predicting the molecular structure of covalent molecules based on the repulsion between valence electron pairs.</p>

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