Question

Question 9 of 29 Rank the elements by effective nuclear charge, Zell for a valence electron. Highest Zeff Lowest Ze Answer Bank BeF MacBook Pro

Answer 1

effective nuclear charge increases from left to right across the period. This is because
decrease in atomic size across the period. So nucleus pull valance electrons more strongly
so highest among the give set is F
highest to lowest given below
F > N > B > Be > Li
******************
isoelectronic means same number of electrons
we need atomic number Z for each

Ti4+
atomic number Z=22
total electrons =18
Ne
atomic number Z=10
total electrons =10
He
atomic number Z=2
total electrons =2

Mg2+
atomic number Z= 12
total electrons =10
Li+
atomic number Z=3
total electrons =2
N3-
atomic number Z=7
total electrons =10
K+
atomic number Z= 19
total electrons =18

s2-
atomic number Z= 16
total electrons =18
B3+
atomic number Z=5
total electrons =3

group A	group B	group C
S2-	B3_+	N3-
K+	Li+	Mg2+
Ti4+	He	Ne

***********

:) Thank you !