Chromium is the odd one out. Here's why:

1. Look at the elements given: Chlorine, Chromium, Aluminium, and Barium.
2. Consider their placement on the periodic table. Chlorine, Aluminium, and Barium are all in groups that are typically considered main group elements.
3. Chromium, on the other hand, is a transition metal.
4. Therefore, Chromium is the odd one out because it is not a main group element like the others.

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Chromium is the odd one out. Here's why:

1. Look at the elements given: Chlorine, Chromium, Aluminium, and Barium.
2. Consider their placement on the periodic table. Chlorine, Aluminium, and Barium are all in groups that are typically considered main group elements. 
3. Chromium, on the other hand, is a transition metal. 
4. Therefore, Chromium is the odd one out because it is not a main group element like the others.

Knowee AI · Accepted Answer

Chromium is the odd one out. Here's why:

1. Look at the elements given: Chlorine, Chromium, Aluminium, and Barium.
2. Consider their placement on the periodic table. Chlorine, Aluminium, and Barium are all in groups that are typically considered main group elements. 
3. Chromium, on the other hand, is a transition metal. 
4. Therefore, Chromium is the odd one out because it is not a main group element like the others.

Which one of the following is the odd one out?ChlorineChromiumAluminiumBarium

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