The scatter plot below shows the first ionization energies and atomic radii of several of the second- and third-period elements of the periodic table: n at (1400,0.75); o at (1300,0.6); c at (1200,0.90); s at (1000,1.1); p at (1100,1.2); b at (800,1.2); be at (900,1.4); si at (750,1.5), mg at (700,1.6); al at (590,1.7); li at (500,2.0); na at (450,2.3); k at (410,2.7) which conclusion can be drawn based on the information in this graph? as the electronegativity value for the elements increases, the atomic radius decreases. the electronegativity values and the atomic radii of these elements are directly proportional. as the electronegativity value of the elements increases, the atomic radius increases exponentially. no relationship appears to exist between the atomic radius and the first ionization energy of an element.

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

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.