Respuesta :
Answer:
helium
Explanation:
helium has the highest ionization energy level
An element's ability to attract shared electron thus forming covalent bonds is a measure of it's electronegativity. Hence, in other indicate decreasing level of electronegativity, arrow must point to the left across groups and down along the column.
- Electronegativity of elements on the periodic table decreases along the groups on the periodic table with elements, Helium and Fluorine being the most electronegative
- Along the columns, electronegativity decreases downwards with cesium and francium being the least electronegative.
Therefore, the arrow should point from right to left across the group and top to bottom along the columns.
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