Choose the statement that is true. a) outer electrons efficiently shield one another from nuclear charge. b) core electrons effectively shield outer electrons from nuclear charge. c) valence electrons are most difficult of all electrons to remove. d) core electrons are the easiest of all electrons to remove. e) all of the above are true.

The statement that is true is as follow:

B) Core electrons effectively shield outer electrons from nuclear charge.

Explanation:

Effective Nuclear Charge:

It is defined as the net positive nuclear charge of the protons which is exerted  on the valence electrons.

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles