Which elements have completely filled outermost shells where are they located?
helium,neon,and argon are those elements which completely filled the outer most shell. helium-He(2) ,neon-Ne (2,8),argon-Ar (2,8,8) . they are nobel gases ..
What are shells on the periodic table?
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
In which column are the elements that have a full valence shell?
How many elements are in each shell?
Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.
How many elements can be there in third period?
Why the number of elements in first period is only two?
There are only two elements in the first period: hydrogen and helium. This is because in quantum physics, this period fills up the 1s orbital. Period 1 elements follows the duet rule, they only need two electrons to complete their valence shell. These elements can only hold two electrons, both in the 1s orbital.
Which is the shortest period?
scientists have now clocked the shortest time measurement ever, expressed as 247 ‘zeptoseconds’, by observing the time it took for a photon (a particle of light) to travel across a hydrogen molecule. in this ultrafast timescale, a zeptosecond is equal to a trillionth of a billionth of a second.
Which element has smallest size *?
Which noble gas is the smallest?
What is the largest noble gas?
Why is Cl more electronegative?
Oxygen is more electronegative than chlorine because of the following reasons : Oxygen is placed towards the left side of fluorine so has one electron less than fluorine. Chlorine is below fluorine and has a new shell of valence electrons is added to it.
What is the most electronegative element and why?
Fluorine is the most electronegative element on the periodic table. Its electronegativity value is 3.98. A fluorine atom needs only one electron to fill its outer electron shell and achieve stability. Due to this reason free fluorine exists as the F– ion.
Is nitrogen more electronegative than oxygen?
But oxygen has 8 protons in the nucleus whereas nitrogen only has 7. A bonding pair will experience more attraction from the oxygen’s nucleus than from nitrogen’s, and so the electronegativity of oxygen is greater.