Electronic Structure of Matter
Which of the following statements best describes the Quantum Mechanical Model of the atom?
A. Electrons move from one position to another.
B. Electrons move around the nucleus in fixed size and energy.
C. Electrons are probably found in a certain volume around the nucleus.
D. Electrons are moving around the massive nucleus of the atom.
C. Electrons are probably found in a certain volume around the nucleus.
If the first and second energy levels of an atom are full, how many orbitals are there?
A. 2 orbitals C. 4 orbitals
B. 3 orbitals D. 5 orbitals
D. 5 orbitals
Which electron transition results in the emission of energy?
A. 1s to 2s C. 3p to 4s
B. 2s to 2p D. 4s to 3p
D. 4s to 3p
Which of the following sublevels is correctly designated?
A. 1p5 C. 3d11
B. 2p6 D. 3f9
B. 2p6
For a neutral atom with the electron configuration 1s2 2s2 2p5 3s1 , which statement is not correct?
A. The atomic number is 10.
B. The atom is in the ground state.
C. The atom is in an excited state.
D. The 1s and 2s orbitals are filled with electrons.
C. The atom is in an excited state.
How many orbitals are of equal energy in the d sublevel?
A. 2 B. 3 C. 5 D. 7
C. 5
Quantum numbers describe an atom in terms of the configuration of its electron around the nucleus. How does the principal quantum number describe an atom?
A. It describes the spin of the electron.
B. It describes the shape of the orbital.
C. It describes the spatial orientation of the orbital.
D. It describes the energy and size of the orbitals.
D. It describes the energy and size of the orbitals.
What is the maximum number of electrons that can be accommodated in principal quantum number n= 4?
A. 4 B. 12 C. 16 D. 32
D. 32