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;
Absent(adj) not existing; lacking; as, the part was rudimental or absent. Absent(adj) inattentive to what is passing; absent-minded; preoccupied; as, an absent air. Absent(verb) to take or withdraw (one's self) to such a distance as to prevent intercourse; -- used with the reflexive pronoun.