Which one of the following is the smallest in size?
N3-
O2-
F-
Na+
In which of the following process highest energy is required
Cu → Cu+
Al → Al+
Zn → Zn+
Li → Li+
Two elements have similar properties because they have the same number of valence electrons are
C and Cl
Ca and Ga
Si and S
S and O
Which of these things you will not find in the periodic table on the wall?
Element Name and Symbol
Atomic weight
Atomic Orbital Radius
Atomic Number
Which sequence of ionisation potential is correct -
B < Be
Be < B
Be = B
None
With the increase in atomic number in period
Metallic character decreases
Metallic character increases
Chemical reactivity decreases
Chemical reactivity increases
The most metallic element in the fifth period is -
silver
rubidium
gold
rhodium
The element with smallest size in the 4th period is
Chlorine
Iodine
Fluorine
Bromine
Elements of which group form anions most readily -
oxygen family
nitrogen group
halogens
alkali metals
About how many known elements are there -
10
50
100
200
