UNIT 1 Chapter 4 Quiz - Moving Electrons

Use the table to determine the color of the flame produced by a sample of potassium bromide (KBr).

• yellow

• green

• violet

• violet-green

Which is the correct shell model for the element sodium (atomic number 11)?

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An atom that has seven valence electrons is in which group?

• alkali metals

• alkaline earth metals

• halogens

• noble gases

To create an ion from a neutral atom, which of these values is changed?

• the number of electrons

• the number of neutrons

• the number of nuclei

• the number of protons

In most ionic compounds, how many electrons does each ion have in its valence shell?

• eight electrons

• either two electrons or eight electrons

• a number equal to its atomic number

• a number equal to its mass number

An ionic compound is formed when

• a hydroxide ion bonds to a nitrate ion.

• a cation bonds to an anion.

• a neutral compound gains an electron.

• an atom gains an electron.

When a magnesium atom forms an ion with a noble-gas configuration, what will its charge be?

• 1+

• 2+

• 2-

• 1-

What is the correct formula for the compound magnesium chloride?

• MgCl

• MgCl₂

• Mg₂Cl

• MgCl₇

Which of these compounds will not form?

• Na₂S

• AlCl₃

• NaCl

• ArCl₂

Chemists have developed a noble gas shorthand for writing the electron configuration of elements. This shorthand works because

• the electron configuration of a noble gas can always be found in the filled subshells for elements larger than hydrogen.

• the electron configuration of a noble gas only contains electrons in the s and p subshells.

• the electrons in the d subshell are always filled after the electrons in the s and p subshells.

• the next highest s subshell of an atom cannot be filled by any electrons until the p and d subshells at all of the lower levels are filled.