Oil is a powerful source of energy used for cars, machines, and many other purposes. while studying sources of energy that could replace the use of oil, a student thinks about solar power, wind power, nuclear power, and electric batteries. the students asks,"which type of source will waste the least energy and provide the most energy in all situations? "

which best describes why a scientist would ask a different question than this one? a. the question asks about subjective personal preferences regarding energy.

b. the question focuses on the objective measurements of amounts of energy.

c. the question has too wide of a focus, as though all situations can be studied at once.

d. the question is focused on the future and finding new answers about changing needs.

it's c. elements are placed in rows based on how may valencies electrons have.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.