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.
According to the Bureau of Labor Statistics, chiropractors in America earn an average salary of about $75,000. There's a wide range of chiropractor salaries, from a low of around $50,000 to a high of $120,000 annually.