When counting electrons, negative ions should have extra electrons placed in their Lewis structures; positive ions should have fewer electrons than an uncharged molecule. When the Lewis structure of an ion is written, the entire structure is placed in brackets, and the charge is written as a superscript on the upper right, outside the brackets.
The word formula or molecule can also apply to elements. e.g. hydrogen molecule H 2, oxygen molecule O 2, ozone molecule O 3 (2nd unstable form of oxygen), phosphorus molecule P 4, sulphur molecule S 8, have respectively 2, 2, 3, 4 and 8 atoms in their molecules. Elements like helium He are referred to as 'monatomic' because they exist as ...
The linear molecule (1) is called butane, or normal butane ( n -butane), whereas the branched molecule (2) is methylpropane (rather than 2-methylpropane, as the methyl group has to be in a 2-position). If the methyl group of (2) were attached to a terminal carbon, the resultant molecule would be the same as (1). Right upper lobe collapse has distinctive features, and is usually easily identified on frontal chest radiographs; much more so than left upper lobe collapse. On the lateral projection it is harder to identify as the soft tissues of the shoulders usually obscure the upper zones, and the collapse is...
A whole molecule may also have a separation of charge, depending on its molecular structure and the polarity of each of its bonds. If such a charge separation exists, the molecule is said to be a polar molecule (or dipole); otherwise the molecule is said to be nonpolar.
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