Random test questions

How does the energy of an electron change when the electron moves closer to the nucleus? a. It decreases. c. It stays the same. b. It increases. d. It doubles. A

The principal quantum number indicates what property of an electron?
position
c. energy level
speed
d. electron cloud shape
C

What is the shape of the 3 p atomic orbital?
sphere
c. bar
Dumbbell
d. two perpendicular dumbbells
B

How many energy sublevels are in the second principal energy level? a. 1 c. 3 b. 2 d. 4 B

What is the maximum number of f orbitals in any single energy level in an atom? a. 1 c. 5 b. 3 d. 7 D

What is the maximum number of d orbitals in a principal energy level? a. 1 c. 3 b. 2 d. 5 D

What is the maximum number of orbitals in the p sublevel? a. 2 c. 4 b. 3 d. 5 B

What is the maximum number of electrons in the second principal energy level? a. 2 c. 18 b. 8 d. 32 B

When an electron moves from a lower to a higher energy level, the electron ____. a. always doubles its energy b. absorbs a continuously variable amount of energy c. absorbs a quantum of energy d. moves closer to the nucleus C

The shape (not the size) of an electron cloud is determined by the electron's ____. a. energy sublevel c. speed b. position d. principal quantum number A

The letter " p " in the symbol 4 p indicates the ____. spin of an electron c. principle energy level orbital shape speed of an electron C

What types of atomic orbitals are in the third principal energy level? a. s and p only c. s, p, and d only b. p and d only d. s, p, d, and f C

According to the aufbau principle, ____. a. an orbital may be occupied by only two electrons b. electrons in the same orbital must have opposite spins c. electrons enter orbitals of highest energy first d. electrons enter orbitals of lowest energy first D

What is the number of electrons in the outermost energy level of an oxygen atom? a. 2 c. 6 b. 4 d. 8 C

If three electrons are available to fill three empty 2 p atomic orbitals, how will the electrons be distributed in the three orbitals? a. one electron in each orbital b. two electrons in one orbital, one in another, none in the third c. three in one orbital, none in the other two d. Three electrons cannot fill three empty 2 p atomic orbitals. A

How many unpaired electrons are in a sulfur atom (atomic number 16)? a. 0 c. 2 b. 1 d. 3 C

How many half-filled orbitals are in a bromine atom? a. 1 c. 3 b. 2 d. 4 A

Stable electron configurations are likely to contain ____. a. filled energy sublevels b. fewer electrons than unstable configurations c. unfilled s orbitals d. electrons with a clockwise spin A

Which electron configuration of the 4 f energy sublevel is the most stable? a. 4 f 6 c. 4 f 7 b. 4 f 10 d. 4 f 14 D

Which of the following electron configurations of outer sublevels is the most stable? a. 4 d 5 5 s 1 c. 4 d 9 5 s 2 b. 4 d 5 5 s 2 d. 4 d 9 5 s 1 B

The quantum mechanical model of the atom ____. a. defines the exact path of an electron around the nucleus b. was proposed by Niels Bohr c. involves the probability of finding an electron in a certain position d. has many analogies in the visible world C

According to the Heisenberg uncertainty principle, if the position of a moving particle is known, what other quantity CANNOT be known? a. mass c. spin b. charge d. velocity D

What is another name for the representative elements? a. Group A elements c. Group C elements b. Group B elements d. transition elements A

Each period in the periodic table corresponds to ____. a. a principal energy level c. an orbital b. an energy sublevel d. a suborbital A

The modern periodic table is arranged in order of increasing atomic ____. a. mass c. number b. charge d. radius C

Who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing elements? a. Henry Moseley c. John Dalton b. Antoine Lavoisier d. Dmitri Mendeleev D

Which of the following electron configurations is most likely to result in an element that is relatively inactive? a. a half-filled energy sublevel b. a filled energy sublevel c. one empty and one filled energy sublevel d. a filled highest occupied principal energy level D

Which of the following statements is true about ions? a. Cations form when an atom gains electrons. b. Cations form when an atom loses electrons. c. Anions form when an atom gains protons. d. Anions form when an atom loses protons. B

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