When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although several elements seemed out of order, later discoveries showed the order to be correct.
3
Which event most likely helped the development of the periodic table?
O Scientists changed the atomic masses to better fit the pattern.
O Scientists refused to consider other ways to organize the elements.
New technology was developed that modified the masses,
O New information changed the understanding of the atom's structure.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.