Question

1. choose the best answer.

which of these elements can be used to write shorthand electron configuration notation?
cl
br
ar
i

1. choose the best answer.

which of these is used to help determine the electron configuration of an element?
element symbol
atomic mass
atomic number
element name

Explanation:

5)

In shorthand electron configuration notation, noble - gas elements are used. Argon (Ar) is a noble gas. Chlorine (Cl), bromine (Br), and iodine (I) are halogens, not noble gases.

The atomic number of an element is equal to the number of electrons in a neutral atom. So, the atomic number is used to determine the electron configuration (since electron configuration is about the arrangement of electrons in an atom). The element symbol, atomic mass, and element name do not directly give the number of electrons.

Answer:

Ar

6)