What factor(s) may be responsible for the ionization energy within a period? select all that apply.
the valence electrons are further from the nucleus when moving from left to right. the valence electrons remain at the same distance from the nucleus when moving left to right.
the diameter of the atom decreases somewhat as electrons are added.
the attractive force of the nucleus increases.

C) The diameter of the atom decreases somewhat as electrons are added, and D) The attractive force of the nucleus increases.

Explanation:

From left to right in the period the atomic number of the element increases. This increases the number of protons in the nucleus, and thus increases the nuclear forces. Also from left to right in the period gradually more and more electrons are added. Electrons that enter the d orbital have poor shielding effect compared to the s and p block elements. The combination of poor shielding effect and the increase in nuclear charge cause the atomic radii to decrease.  

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

explanation:

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year