Molecules are held together by either covalent bonding or ionic bonding. Several types of non-metal elements exist only as molecules in the environment. For example, hydrogen only exists as hydrogen molecule. A molecule of a compound is made out of two or more elements.
In general, chiropractic services range from approximately $30 to $200 per session. Of course, each type of treatment has a different cost. For example, an initial consultation with a chiropractor may be provided at no charge, while a typical therapy session costs about $65 on average.
Training in a related field, such as physical therapy, can sometimes be applied to a job as a chiropractic assistant. According to Payscale.com, chiropractic assistants made a median salary of $27,748 per year as of January 2016. Chiropractic assistants work in practice offices, where they are responsible for office organization and administrative duties, as well as attending to patients.