Cl, Br, I, if this is Dobereiner's triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Br is -
162.5
91.5
81.25
45.625
In which of the following process highest energy is required
Cu → Cu+
Al → Al+
Zn → Zn+
Li → Li+
Which has the maximum atomic radius?
Al
Si
P
Mg
Which of the following is the atomic number of a metal?
32
34
36
38
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 of the following is the correct order of relative size?
I- > I+ >I
I- > I > I+
I > I+> I-
I+ > I- > I
About how many known elements are there -
10
50
100
200
Which one of the following ions has the highest value of ionic radius -
O2-
B3+
Li+
F-
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+