Respuesta :
Answer:
Argon
Explanation:
The arrangement of electrons in an atom is governed by the Aufbau principle according to which electrons are added to atomic orbitals such that the lowest energy orbitals get occupied first before the higher energy orbitals. The arrangement of energy levels in increasing energy order is:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p......
's' , 'p', 'd' orbitals can accommodate a maximum of 2,6 and 10 electrons respectively.
From the given information:
First energy level corresponds to n = 1, and is fully filled i.e. 1s²
Second energy level corresponds to n = 2, and is fully filled i.e. 2s²2p⁶
Third energy level corresponds to n = 3 and it has 8 electrons i.e. 3s²3p⁶
The neutral atom has a total of 18 electrons with an electronic configuration of:
1s²2s²2p⁶3s²3p⁶
Based on the periodic table the atom is with atomic number = 18 is argon (Ar)
A neutral atom is an atom that has the same number of protons and electrons.
Energy Levels are 3-dimensional regions located around the nucleus where electrons encircle the atomic nucleus in layers.
These layers are divided into regions known as principal energy levels which are numbered in 1, 2, 3 .... (to infinity)
The principal energy levels can harbour up to 2n² electrons
From the given information:
- A neutral atom has its two first energy levels filled.
Thus;
The maximum number of electrons in the first energy level when n =1 is:
= 2(1)² electrons
= 2 electrons
The maximum number of electrons in the second energy level when n = 2 is:
= 2(2)² electrons
= 8 electrons
In the third energy level, it is stated that it has 8 electrons and no other electrons:
Thus, the atomic number of the element = 2 + 8 + 8
= 18
Therefore, we can conclude that the name of the element is Argon with an atomic number 18.
Learn more about atomic numbers here:
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