Best Answer: First true and second false.- ... Isotopes of an element have different atomic masses is TRUE. An isotope is an element, say carbon for example, that ...
Absent-mindedness is where a person shows inattentive or forgetful behaviour. It can have three different causes: a low level of attention (blanking or zoning out) intense attention to a single object of focus (hyperfocus) that makes a person oblivious to events around him or her;
Synonym Discussion of preoccupied. abstracted, preoccupied, absent, absentminded, distracted mean inattentive to what claims or demands consideration. abstracted implies absorption of the mind in something other than one's surroundings, and often suggests reflection on weighty matters walking about with an abstracted air.