Question

multiple choice 1 point
what is the symbol for effective nuclear charge?
$z_{\text{eff}}$
p
z
s
clear my selection
25 multiple choice 1 point
______ is a group of ions which all have the same number of electrons.
an isoelectronic series
an electron
electronegativity
an ion
clear my selection

Explanation:

Question 24

In chemistry (a subfield of Natural Science), the effective nuclear charge is represented by the symbol \( Z_{\text{eff}} \). The other options: \( P \) is not for effective nuclear charge, \( Z \) is the atomic number (proton number), and \( S \) is related to shielding constant.

In chemistry (Natural Science subfield), an isoelectronic series is defined as a group of ions (or atoms/molecules) that have the same number of electrons. An electron is a particle, electronegativity is a measure of atom's ability to attract electrons, and an ion is a charged particle—none of these match the definition except isoelectronic series.

Answer:

A. \( Z_{\text{eff}} \)

Question 25