Naming Compounds and Writing Formulas

The correct name for the N3− ion is:

• nitrate ion.

• nitric ion.

• nitride ion.

• nitrite ion.

Elements of Group 4A:

• generally form positive ions.

• generally form negative ions.

• do not commonly form ions.

• do not combine with other elements.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the ionic charge on the chromium ion in the ionic compound that has the formula Cr2O3?

• 3+

• 2-

• 5-

• 5+

Which element when combined with chlorine would most likely form an ionic compound?

• lithium

• carbon

• phosphorus

• bromine

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the formula for calcium hydrogen phosphate?

• CaHPO4

• Ca2HPO4

• Ca(H2PO4)2

• Ca(HPO4)2

A cation is any atom or group of atoms with:

• a positive charge.

• no charge.

• a negative charge.

• more electrons than the corresponding atoms.

The cation Fe3+ is formed when:

• an atom of iron loses two electrons.

• an atom of zinc loses two electrons.

• an atom of iron loses three electrons.

• an atom of iron gains three electrons.

A molecular formula:

• gives information about molecular geometry.

• can be written for ionic compounds.

• shows the number and kinds of atoms in a molecule of a compound.

• uses superscripts to show the number of atoms of each kind.

The metals in Groups 1A, 2A, and 3A:

• gain electrons when they form ions.

• form ions with a charge found by subtracting 8 from the group number.

• all form ions with a 1+ charge.

• lose electrons when they form ions.

When naming an ion of a transition metal that has more than one common ionic charge, the numerical value of the charge is indicated by:

• prefix.

• suffix.

• roman numeral following the name.

• superscript after the name.