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Worksheetselectonic configuration grade 9
Total questions: 30
Worksheet time: 20mins
Determine the electronic configuration of the following atoms.
4Be
(a)
Determine the electronic configuration of the following atoms.
28Ni
(a)
___10. What atom matches this electron configuration?
1s2 ,2s2, 2p6, 3s2, 3p6, 4s2 ,3d10,4p6, 5s1
A. Helium
B. Lithium
C. Hydrogen
D. Rubidium
Which element has 2,8,8 electrons per shell?
Lead
Fluorine
Neon
Argon
1s22s22p63s23p64s23d10
Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed.
This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state?
1s2; 2s2; 2p6; 3s2; 3p6; 4d1
1s2; 2s2; 2p6; 3s2;3p6; 3d1
1s2; 2s2; 2d6; 3s2; 3d6; 4s1
1s2; 2s2; 2p6; 3s2; 3p6; 4s1
Which two particles are contained in the nucleus of an atom?
Protons and Neutrons
Protons and Electrons
Electrons and Neutrons
How many electrons can the third shell have?
Two
Eight
Five
Three
What charge do electrons have?
Positive
Neutral
Negative
What are the three main subatomic particles and their charges?
Protons, electrons, and quarks
Protons, neutrons, and photons
Protons, neutrons, and electrons
Protons, electrons, and positrons
What is the atomic structure of an atom?
The atomic structure of an atom consists of a nucleus, which contains electrons and neutrons, surrounded by protons in energy levels or shells.
The atomic structure of an atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons in energy levels or shells.
The atomic structure of an atom consists of a nucleus, which contains electrons and protons, surrounded by neutrons in energy levels or shells.
The atomic structure of an atom consists of a nucleus, which contains electrons and protons, surrounded by neutrons in orbitals or subshells.
Which one of the following compounds contains two ions with different electronic configurations?
CaCl2
MgF2
MgO
NaCl
The vanadium atom (atomic number 23) in its ground state has the electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d3 4s2
1s2 2s2 2p6 3s2 3p6 3d2 4s3
1s2 2s2 2p6 3s2 3p6 3d1 4s2 4p2
1s2 2s2 2p6 3s2 3p6 3d2 4s2 4p1
The number of electrons in the 3d orbital of the atom of atomic number 27 is
5
6
7
10
Which of the following statements regarding electronic orbitals is/are correct?
Each p-orbital can hold a maximum of six electrons.
The 3p-orbitals have a higher energy level than the 3s-orbital.
The three 3p-orbitals have slightly different energy levels.
The 1s-orbital has the same size and shape as the 2s-orbital.
Which one of the following is the electronic structure of a metal with a maximum oxidation state of +3?
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p4
1s2 2s2 2p6 3s2 3p1
1s2 2s2 2p6 3s2 3p6 3d10 4s2
Which one of the following contains no unpaired electrons in the ground state?
Be
F
Si
N
Which one of the following is the maximum number of atomic orbitals having a principal quantum number of two?
2
4
8
9
Which one of the following does not represent the electronic configuration of an atom in its ground state?
1s2 2s2 2p3
1s2 2s2 2p4
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3d1
To which one of the following energy levels (denoted by n) does the electron in a hydrogen atom return when the emission spectrum is in the ultraviolet region;
n= 1
n = 2
n = 3
n = 4
Which one of the following is the electronic configuration of the bromine atom?
1s22s22p63s23p63d104s14p6
1s22s22p63s23p63d104s24p7
1s22s22p63s23p63d104s24p5
1s22s22p63s23p63d104s24p6
