1. Chloride: Cl-, monatomic, not an oxoanion
QUESTION:
Which of the following is not an oxoanion? A. chloride, B. hypochlorite, C. chlorite D. chlorate, E. perchlorate
Oxoanion or oxyanion is a polyatomic ion, has atoms of oxygen and another element.
Chloride: Cl-, monatomic, not an oxoanion
Polyatomic anions contaiing oxygen atoms generally have names ending in “ate” or “ite”,
Hypochlorite: ClO- or OCl- , Chlorite: ClO2-
Chlorate: ClO3- , Perchlorate: ClO4-
Exceptions: peroxide (O22-) and hydroxide (OH-)
SCRIPT:
Which of the following is not an oxoanion? A. chloride, B. hypochlorite, C. chlorite D. chlorate, E. perchlorate
PAUSE CLICK An oxoanion (PRONOUNCED: oxo + an + ion) or oxyanion is a polyatomic ion HIGHLIGHT polyatomic
Made up of atoms of oxygen and another element.
CLICK
By now you should know that chloride is monatomic, and its symbol is Cl- (READ AS C L with a negative one charge)
The correct answer is A. It is not polyatomic and doesn’t have oxygen.
Polyatomic anions with oxygen have names ending in “ate” or “ite”,
HIGHLIGHT “ate” and “ite” endings in choices B through E
Examples are hypochlorite, choice B, which has a formula of ClO-, or OCl-…
HIGHLIGHT formula
Chlorite, which has one more oxygen than hypochlorite, but the same charge
Chlorate, which has one more oxygen than chlorite, again with the same charge
And perchlorate, which has one more oxygen that chloriate, and with the same negative one charge.
An “ide’ ending for a polyatomic anion usually means no oxygen, except peroxide (O22-) and hydroxide (OH-).
PAUSE END RECORDING

2. Video ID: © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08