Stability and Bonding of Elements

The atom that contains the fewest electrons is __.

• oxygen

• hydrogen

• helium

• water

In sodium chloride, which atom loses an electron?

• sodium

• salt

• neither

• chloride

A compound __.

• is composed of only metals

• is a pure element

• is a combination of two or more elements

• has the same properties as its parts

Tags

NGSS.MS-PS1-1

The chemical formula for sucrose is C₁₂H₂₂O₁₁. How many oxygen atoms are there in each molecule of sucrose.

• 22

• 45

• 12

• 11

Tags

NGSS.MS-PS1-1

Chemical compounds are __.

• always unstable

• always stable

• more stable than their individual elements

• less stable than their individual elements

Tags

NGSS.MS-PS1-1

In general, noble gases react with __.

• water

• metals

• other noble gases

• nothing

When an atom’s outer energy levels are not filled completely, the atom __.

• can gain, lose, or share electrons

• is a noble gas

• cannot form a compound

• is very stable

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

NaCl is the chemical formula for what compound?

• water

• sodium chloride

• sodium iodide

• chlorine gas

When elements form bonds, it changes their __ properties.

• chemical

• physical

• mass

• chemical and physical

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Why is potassium iodine added to table salt?

• It adds to the flavor of salt

• Iodine is an element essential for health

• Iodine is in the formula for table salt

• Table salt causes high blood pressure