Advertisements
Advertisements
प्रश्न
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Advertisements
उत्तर
The valence electrons in the same shell (outermost shell) increase progressively by one across the period. The first element hydrogen has one valence electron and helium has two valence electrons.
On moving from left to right in a period, valency increases from 1 to 4, then falls to one and ultimately to zero in the last group.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Explain why, the noble gases are placed in a separate group.
What are the periods in a periodic table? Give two characteristics of each.
Name the noble gas with 3 shells.
Give the chemical formula of carbonic acid
______ is the longest period in the periodical table.
How does the property vary in periods and in groups?
The longest period of the Modern Periodic Table is period.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
