Previous experiment the chemistry student carried out the next experiment and recorded the data for you in the following data table directions Place 100 ml of filtered saturated pbcl2 in a 150 ml Beaker and put it under a dryer to evaporate the water record the necessary data in the data table complete the data table since the data allows it you should use three significant digits for all your answers molecular weight of pbcl2 equals 278 g/mol mass of Beaker + pbcl2 equals 62.19 grams mass of Beaker equals 57.77 grams

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.

c. is the answer

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