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;
The term feeble-minded was used from the late nineteenth century in Great Britain, Europe and the United States for disorders later referred to as illnesses or deficiencies of the mind. At the time, mental deficiency encompassed all degrees of educational and social deficiency.