You have two marbles, one glass and one metal. you put the metal one into a graduated cylinder and the water level rise to 7 marks above the initial water level. when you put the glass marble into the graduated cylinder the water level rises:

a) be the same level as it was in cylinder 1
b) be at a higher level than it was in cylinder 1
c) be at a lower level than it was in cylinder 1

The answer is A) Be at the same level as it was in cylinder 1.

Explanation:

The weight wouldn't really apply to where the water mark would be. Since both would sink to the bottom and they are the same shape/size, the water would rise to the same level.

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.