Arrange F, Cl, O, N in the decreasing order of electronegativity -
O > F > N > Cl
F > N > Cl > O
Cl > F > N > O
F > O > N = Cl
Which one of the following ions has the highest value of ionic radius -
O2-
B3+
Li+
F-
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species -
Cl < F < S < O
O < S < F < Cl
S < O < Cl < F
F < Cl < O < S
On moving horizontally across a period, the number of electrons in the outermost shell increases from ___ to
2, 8
2, 18
1, 8
1, 18
Which one of the following has the smallest size?
AI
AI+
AI2+
AI3+
About how many known elements are there -
10
50
100
200
The size of the following species increases in the order -
Mg2+ < Na+ < F- < Al
F- < Al < Na+ > Mg2+
Al < Mg < F- < Na+
Na+ < Al < F- < Mg2+
Which one of the following is the smallest in size?
N3-
Na+
Which of the following properties generally decrease along a period?
Atomic size
Non - metallic character
Metallic character
Both (1) and (3)
Which of the elements has the least non-metallic character -
Fluorine
Chlorine
Bromine
Iodine
