Electronic configuration of element x is 2,7 write the position in periodic table.
2nd period 17th group
3rd period 1st group
3rd period 2nd group
2 nd period 18 th group
Mendeleev’s periodic law states that the properties of elements are the periodic function of their
valencies
atomic masses
atomic numbers
electro negativities
According to Newlands’ law of octaves, when elements are arranged in the increasing order of their atomic masses, every
eighth element has properties similar to those of the first element
seventh element has properties similar to those of the first element
eighth element has properties similar to those of the second element
seventh element has properties similar to those of the second element
In how many blocks where elements are divided?
4
7
18
8
Vertical column in a periodic table is
period
group
table
shell
How many periods and groups are in Mendeleev’s periodic table?
eight & six
six & eight
five & seven
seven & five
Name the element which has least ionisation energy
Rb
Cs
F
O2
An element has atomic number 12, is placed in which period and group?
3rd period and 2 group
4th period and 2 group
3rd period of group 3
3rd period and 5th group
On moving left to right across a period, the acidity of the oxides of elements
increases
decreases
remains the same
first increases and then decreases