Chemical Bonds Ch.7-8

Some elements combine chemically and no longer have the same ________________ they did before forming a compound.

• valence electons
• energy
• properties
• group number

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

A _________________ is composed of symbols and subscripts indicating the number of atoms of an element in a compound.

• Chemical Equation
• Chemical Reaction
• Synthesis Reaction
• Chemical Notation

Atoms gain lose, gain, or ______electrons to get a stable outer energy level.

• share
• split
• create
• destroy

Tags

NGSS.MS-PS1-1

A ____________is the force that holds atoms together in a compound.

• Chemical Formula
• Chemical Reaction
• Chemical Bond
• Synthesis Reaction

Which of the following BEST describes a chemical bond?

• A physical connection holding atoms together.

• A force holding atoms together.

• Two elements combined into a single substance.

Tags

NGSS.HS-PS1-3

When does an atom become an ion?

• When it gains or loses electrons and takes on a charge.

• When it is stable because it has a full set of valence electrons.

• When it forms a compound with another atom.

If an atom ​ (a)   electrons, it will become negative.

If an atom ​ (b)   electrons, it will become positive.

• gains
• loses
• destroys
• creates

Tags

NGSS.MS-PS1-1

How many electrons do most elements want to have in their outer shell to be stable?

What combination of elements will form a covalent compound?

• Metal and metal.

• Metal and nonmetal.

• Nonmetal and nonmetal.

Tags

NGSS.MS-PS1-1