Question

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?​

Answer 1

Answer:

Argon

proton 18

neutron 22

electronic configuration 2,8,8

period 3

group 18

Answer 2

$\huge\bold{AnSwEr}$

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

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Hope it's helpful :)