The above image shows the rough mapping for the Modern Periodic Table. In 1913,Henry Moseley showed that the atomic number (symbolised as Z) of an element is a more fundamental property than its atomic mass. Accordingly, Mendeleev‘s Periodic Law was modified and atomic number was adopted as the basis of Modern Periodic Table and the Modern Periodic Law can be stated as follows : 'Properties of elements are a periodic function of their atomic number.'
1. Identify the element whose electronic configuration is 2,8,2
a. Lithium
b. Sodium
c. Magnesium
d. Chlorine
2. Identify the element whose electronic configuration is 2,8,3
a. Silicon
b. Aluminium
c. Boron
d. None
3. Identify the element whose electronic configuration is 2, 8, 5
a. Phosphorous
b. Sulphur
c. Argon
d. Thallium
4. Identify the element whose electronic configuration is 2,1
a. Hydrogen
b. Helium
c. Lithium
d. Potassium
5. What lies in the second group of 7th period?
a. Metals
b. Non metals
c. Halogens
d. Alkaline earth metals
