Question

1. choose the best answer. which of these elements can be used to write shorthand electron configuration notation? i al cl br 6) choose the best answer. which of these is used to help determine the electron configuration of an element? element symbol element name atomic number atomic mass

Explanation:

For question 5: Shorthand electron configuration uses the nearest preceding noble gas (a full valence shell element) as a shortcut. Argon (Ar) is a noble gas, while I, Cl, Br are halogens.
For question 6: The atomic number equals the number of protons, which equals the number of electrons in a neutral atom, so it directly determines electron configuration. Element symbol/name are identifiers, atomic mass relates to protons+neutrons.

Answer:

1. Ar
2. atomic number