Question

it is easier to determine the electron configurations for the p - block elements in periods 1, 2, and 3 than to determine the electron configurations for the rest of the p - block elements in the periodic table because they have a larger number of core electrons. their electrons are assigned to s and p orbitals only. their electrons are placed in a higher number of orbitals. they have more valence electrons available for bonding.

Explanation:

Period 1 - 3 p - block elements only have electrons assigned to s and p orbitals. As the period number increases, more types of orbitals (such as d and f) come into play, making electron - configuration determination more complex. So the simplicity of orbital types for period 1 - 3 p - block elements makes it easier to determine their electron configurations.

Answer:

their electrons are assigned to s and p orbitals only.