The atom that contains the fewest electrons is _______.

• water

• hydrogen

• oxygen

• helium

When elements form bonds, it changes their ________ properties.

• mass

• chemical and physical

• physical

• chemical

Why is potassium iodine added to table salt?

• Table salt causes high blood pressure.

• Iodine is in the formula for table salt.

• It adds to the flavor of salt.

• Iodine is an element essential for health.

Compounds that are hydrates contain what ingredient?

• nitrogen

• water

• hydrogen chloride

• chlorine

What kind of charge does an ionic compound carry?

• unknown

• negative

• none

• positive

The iodine ion I^- carries what type of charge?

• positive

• neutral

• negative

• both

Binary compounds are composed of _______ atoms.

• one

• two

• four

• many

NaCl is the chemical formula for what?

• sodium chloride

• sodium metal

• water

• chlorine gas

How many electrons are shared in a double bond?

• one

• two

• one pair

• two pairs

For an ion, the oxidation number is ________.

• always negative

• zero

• the same as the charge on the ion

• one less than the charge on the ion