Why do electrons enter the 4s orbital before entering the 3d orbital?

because the 4s orbital is at a lower energy level

What does the Aufbau principle state?

Electrons will be added to an atom starting from the lowest possible level.

What does Hund’s rule state?

orbital can have two electrons if other orbitals has at least one electron.

According to the Pauli exclusion principle, when can two electrons occupy the same orbital?

only if they have opposite spins

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Chemistry: Electron Configurations

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In this lesson, you will write electron configurations. #science #chemistry

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Questions 14

Answers

1
Which element has the electron configuration [Xe] 6s2 4f14 5d10 6p2?
lead (atomic number 82)
copper (atomic number 29)
mercury (atomic number 80)
potassium (atomic number 19)
gold (atomic number 79)
2
Why do electrons enter the 4s orbital before entering the 3d orbital?
because the 3d orbital is at lower energy level
because the 4s orbital is at a lower energy level
because the 4s orbital is at a higher energy level
because both the 4s and 3d orbitals are at the same energy level
3
What does the Aufbau principle state?
Electrons will be added to an atom starting from the lowest possible level.
Electrons will be added to an atom in a random order.
Electrons will be added to an atom if the orbitals are different colors.
Electrons will be added to an atom in a symmetrical manner.
4
What does Hund’s rule state?
orbital can contain two electrons if electrons have different energy levels
orbital can contain two electrons only if electrons have opposite spins.
orbital can have two electrons if other orbitals has at least one electron.
orbital can contain two electrons only if other orbital sublevel are empty
5
Which element has three unpaired electrons in its p orbital?
carbon (atomic number 6)
nitrogen (atomic number 7)
oxygen (atomic number 8)
beryllium (atomic number 4)
6
Which of the following states that two electrons can occupy the same orbital only if they have opposite spins?
DeBroglie’s theory
Hund’s rule
Aufbau principle
Dalton’s theory
Pauli exclusion principle
7
What does the sign ⥮ represent with respect to electrons?
different principal energy levels of two electron
distance of two electrons from the nucleus
opposite spin of two electrons
attraction between two electrons
8
What is the noble gas configuration for silicon?
[Ar] 4s1
[Kr] 5s1
[Ne] 3s23p1
[Ne] 3s23p2
9
What is the magnetic quantum number value for an element with n = 1?
-2, -1, 0
-2, -1, 0, +1, +2
-1, 0, +1
0
10
The filling of which orbital is represented by the first transition series?
3d
2p
2s
3s
11
What is the position of an element in the periodic table if its electron configuration is 1s2 2s2 2p6 3s2 3p5?
It’s a group 7A element.
It’s a group 5A element.
It’s a group 6A element.
It’s a group 3A element.
12
Which electron configuration represents the element carbon (atomic number 6)?
1s2 2s2 2p4
1s2 2s2 2p6
1s2 2s2 2p2
1s2 2s2
13
According to the Pauli exclusion principle, when can two electrons occupy the same orbital?
only if they have opposite spins
only if there is no place else to put them
only if they are alike in all their properties
only if they have the same spin
14
What is the electron configuration of an element with atomic number 20?
1s2 2s2 2p6 3s2 3p5
1s2 2s2 2p6 3s2 3p6 4s2
1s2 2s2 2p6 3s2 3p6
1s2 2s2 2p6 3s2
1s2 2s2 2p6

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