On left, C l with 2 black dots each above, left, and below and 1 black dot right. On the right, C l with 2 black dots each above, right, and below and 1 black dot left. Chlorine, which is used to clean swimming pools, exists as two chlorine atoms covalently bonded to each other.

How many valence electrons does one chlorine (Cl) atom have?

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.