1) Which of these is the electron configuration of an atom most likely to lose an electron?

• 1s² 2s² 2p⁶

• [He]2s² 2p⁵

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p6 4s1 1s2 2s2 2p6 3s2 3p6 4s1

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A positive ion forms when ___________.

• an atom loses one or more valence electrons

• an atom gains one or more valence electrons

• electrons are pulled into the nucleus

• electrons are pushed out of the nucleus

Why is the calcium ion (Ca²⁺) more stable than the calcium atom (Ca)?

• Twenty electrons are more stable than eighteen electrons.

• Eighteen electrons are less stable than twenty electrons.

• The two electrons more than the noble gas configuration is more stable.

• The noble gas configuration is more stable.

Tags

NGSS.HS-PS1-1

• 1s² 2s² 2p⁶

• [He]2s² 2p⁵

• 1s² 2s² 2p⁶ 3s1

• 1s² 2s² 2p⁶ 3s²

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Explain why the zinc 2+ ion has some stability.

• The zinc ion has achieved a noble gas configuration.

• The zinc ion has full s, p, and d sublevels to form a pseudo-noble gas configuration.

• The zinc ion is a transition metal.

• The zinc ion has bonded with two free electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following lattice energies represents the strongest force of attraction holding the ions in place?

• 632

• 769

• 910

• 2142

Tags

NGSS.HS-PS1-4

An ionic compound that will conduct an electric current when it forms an aqueous solution is a(n) _________.

• electrolyte

• nonelectrolyte

• molecular compound

• crystal lattice crystal lattice

Tags

NGSS.HS-PS1-3

Ionic crystals have high melting points and high boiling points because ________.

• ionic bonds are relatively weak

• ionic solids are excellent conductors of electricity

• ionic bonds are relatively strong

• ionic liquids do not conduct electricity. ionic liquids do not conduct electricity.

Tags

NGSS.HS-PS3-4

In the ionic solid sodium chloride (NaCl), there is a _________ ratio of sodium ions to chlorine ions.

• one to two

• two to one

• one to one

• one and a half to one one and a half to one

Tags

NGSS.MS-PS1-1

What is the ionic ratio of aluminum to oxygen in the ionic compound aluminum oxide?

• three to one

• one to two

• three to two

• one to three