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
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+
About how many known elements are there -
10
50
100
200
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 hydroxides is most basic?
Be(OH)2
Ba(OH)2
Ca(OH)2
Mg(OH)2
Which one of the following has the smallest size?
AI
AI+
AI2+
AI3+
Which of the following is the atomic number of a metal?
32
34
36
38
In which of the following process highest energy is required
Cu → Cu+
Al → Al+
Zn → Zn+
Li → Li+
The most metallic element in the fifth period is -
silver
rubidium
gold
rhodium
