Explique por qué el agua y el cloruro de berilio tienen formula global AX2 y sin embargo el cloruro de berilio es lineal con ángulos de enlace de 180º y el agua es angular con ángulos de 104,5º. Fundamente su respuesta planteando las fórmulas de Lewis de cada sustancia y aplicando sus conocimientos sobre la TRPE y la TEV. ​

Explain why water and beryllium chloride have the global formula AX2 and yet beryllium chloride is linear with bond angles of 180º and water is angular with angles of 104.5º. Support your answer by setting out the Lewis formulas for each substance and applying your knowledge of ERT and VTE.

i am going to put the answers in order i dint feel like typing it out so yeah

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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.