there is an element B
outermost shell contains 8 electrons
number of shells is 3
tell the number of protons and neutrons, Electronic confiuration, period and group number ..
What is the name of element?
Answers
Answered by
4
Answer:
Argon
proton 18
neutron 22
electronic configuration 2,8,8
period 3
group 18
Answered by
660
Given :
Valence shell electrons = 8
Number of cells = 3
Number of protons :
As we know,
Capacity of first shell = 2 electrons
Capacity of second shell = 8 electrons
And,
Valence shell electrons = 8
So,
Electronic Configuration = 2, 8, 8
And,
Atomic Number = 18
Atomic Number = Number of protons
Thus,
Number of protons = 18
Number of neutrons :
As we know,
Atomic Number = 18
So,
Element is Argon.
And,
It's mass number = 40
So,
Number of neutrons = Mass
Number - Atomic Number
= 40 - 18
= 22
Electronic Configuration :
2, 8, 8
Periodic Number :
Number of shells = 3
Periodic number = Number of shells
= 3
Group number :
valence shells electrons = 8
Group number = 10 + 8
= 18
Name of Element :
Argon
_______________________
Hope it's helpful :)
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