Explain why the first period of the periodic table is exception
in case of
Number of electrons increase from 1 to 8 in each period
Answers
Answer:
As you move from left to right across a period, the physical properties of the elements change.
One loose trend is the tendency for elemental states to go from solid to liquid to gas across a period. In the extreme cases, Groups 1 and 18, we see that Group-1 elements are all solids and Group-18 elements are all gases.
Many of the changes in physical properties as you cross a period are due to the nature of the bonding interactions that the elements undergo. The elements on the left side of a period tend to form more ionic bonds, while those on the right side form more covalent bonds.
Key Terms
boiling point: The temperature at which a liquid boils, with the vapor pressure equal to the given external pressure.
melting point: The temperature at which the solid and liquid phases of a substance are in equilibrium; it is relatively insensitive to changes in pressure.
Answer:
because it does not obey the octat rule they fallow the duplet rule it has only 2 electron on it outer most cell.