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;
adj. preoccupied. 1  absent-minded. 2  daydreaming. 3  inattentive. lost in thought.  out in 1  space. out to lunch. 2  remote. withdrawn.