Elements that lie in the same column on the periodic table (called a group) have identical valance electron configurations and consequently behave in a similar fashion chemically. For instance, all the group 18 elements are inert, or noble gases. Element groups are either nonmetals or various subsets of metals, but there is no distinct line between the two types of elements. Metal elements are usually good conductors of both electricity and heat. Subsets are based on similar characteristics and chemical properties.
3 doctors agreed: A few hours: The typical dilating drops used at most eye doctors last about 4-6 hours. Some individuals are more sensitive to the effects and can remain dilated for up to a day. And if stronger dilating drops were used for a particular reason, their effects could last from 8 to 24 hours. ...Read more.
Posts: 74. Re: How long after eyes being dilated can you drive? for the lasik pre-exam, the eyes are dilated way more then for a regular exam, and they said one needed a driver for the appointment as you aren't able to drive after the exam. I wouldn't have been able to drive after. don't recall ever having had a problem driving within 20 or 30 min. after dilation, but wondered if dilation for pre-exam for Lasik surgery is different from dilation for regular eye exam. Is there a difference in the dilation solutions used?