Chapter 4 and 5 Test

Question 1

The principal quantum number indicates which property of an electron?

Answer 1

Energy level.

Question 2

The atomic number of an element is the total number of which particles in the nucleus?

Answer 2

Protons.

Question 3

Which of the following was originally a tenet of Dalton’s atomic theory, but had to be revised about a century ago?

Answer 3

Atoms are tiny indivisible particles.

Question 4

What is the maximum number of d orbitals in a principal energy level?

Answer 4

5.

Question 5

Which of the following is rue about subatomic particles?

Answer 5

The mass of a neutron nearly equals the mass of a proton.

Question 6

What is the maximum number of f orbitals in any single energy level in an atom?

Answer 6

7.

Question 7

In the Bohr model of the atom, an electron in an orbit has a fixed…

Answer 7

Energy.

Question 8

Isotopes of the same element have different…

Answer 8

number of neutrons.

Question 9

The particles that are found in the nucleus of an atom are..

Answer 9

Protons and neutrons.

Question 10

The nucleus of an atom is…

Answer 10

The central core and is composed of protons and neutrons.

Question 11

What is the basis for exceptions to the aufbau diagram?

Answer 11

Filled and half-filled energy sublevels are more stabel than partially-filled energy sublevels.

Question 12

Who was the man who lived from 460 B.C.-370 B.C. and was among the first to suggest the idea of atoms?

Answer 12

Democritus.

Question 13

How is the number of neutrons in the nucleus of an atom calculated?

Answer 13

Subtract the number of protons from the mass number.

Question 14

If three electrons are available to fill three empty 2p atomic orvitals, how will the electrons be distributed in the three orbitals?

Answer 14

One electron in each orbital.

Question 15

The letter “p” in the symbol 4p^3 indicates the…

Answer 15

orbital shape.

Question 16

What is the maximum number of orbitals in the p sublevel?

Answer 16

3.

Question 17

What types of atomic orbitals are in the third principal energy level?

Answer 17

s, p, and d only.

Question 18

What is the shape of the 3p atomic orbital?

Answer 18

dumbbell.

Question 19

All atoms are…

Answer 19

neutral, with the number of protons equaling the number of electrons.

Question 20

Stable electron configurations are likely to contain..

Answer 20

Filled energy sublevels.

Question 21

What is the electron configuration of potassium?

Answer 21

1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

Question 22

When an electron moves from a lower to a higher energy level, the electron…

Answer 22

Absorbs a quantum of energy.

Question 23

The smallest particle of an elecment that retains the properties of that element is a(n)…

Answer 23

atom.

Question 24

Dalton’s atomic theory included which idea?

Answer 24

Atoms of the same element are always identical.

Question 25

What does the number 84 in the name krypton-84 represent?

Answer 25

The mass number.

Question 26

Describe the three different principles (or rules) that govern the building of an electron configuration.

Answer 26

Aufbau Principle: Electrons occupy the lowest energy first.
Pauli Exclusion Principle: An orbital can hold a maximum of two electrons; spin (up and down)
Hund’s Rule: Electrons half-fill orbitals of the same energy before pairing up.