4.3 Electron Configurations Quiz

A ground-state atom of which element has one electron in its fourth and outermost main energy level? a. K b. Na c. B d. Ga

a

In a ground-state hydrogen atom in which orbital is the electron? a. 1s b. 2s c. 2p d. 3s

a

According to the Aufbau principle, which of the following sublevels is lowest in energy? a. 3d b. 4s c. 4p d. 5s

b

Oxygen has the electron configuration of 1s^2 2s^2 2p^4. In this arrangement, how many inner-shell electrons does oxygen have? a. 1 b. 2 c. 4 d. 8

b

The noble gas notation for the electron configuration of bromine is [Ar] 3d^10 4s^2 4p^5. How many unpaired electrons are there in an atom of bromine in the ground state? a. 0 b. 1 c. 3 d. 5

b

How many electrons are present in an atom of Calcium that has the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2? a. 6 b. 16 c. 20 d. 36

c

The statement that no two electrons in the same atom can have the same four quantum numbers is a restatement of... a. Bohr's law b. Hund's rule c. the Aufbau principle d. the Pauli exclusion principle

d

Which of the following is a noble gas? a. Carbon b. Oxygen c. Sodium d. Neon

d

uses dots to show valence electrons only (omits the "core" electrons)

dot notation (AKA Lewis dot structure)

uses arrows, shows all axes for each sublevel

orbital notation

3 ways to denote electrons

orbital notation, electron configuration notation, dot notation

Separating unpaired electrons into as many orbitals as possible... a. places the electrons farther from the nucleus b. results in more valence electrons c. minimizes the repulsion between electrons d. produces a greater spin quantum number

c

The ground-state electron configuration of neon is 1s^2 2s^2 2p^6. In this arrangement, how many of neon's p orbitals are completely filled? a. 1 b. 2 c. 3 d. 6

c

electrons seek and fill the lowest energy positions in an atom

Aufbau Principle

orbitals of equal energy get one electron each before doubling up

Hund's rule

no two electrons in any atom have the same set of quantum numbers

Pauli exclusion principle

the arrangement of electrons in an atom

electron configuration

uses superscripts, consolidates axes, periodic table shows Noble Gas abbreviated form

electron configuration notation

electron-containing main energy level with the highest principal quantum number

highest-occupied energy level

electrons that are not in the highest-occupied energy level

inner shell electrons (core electrons)