The smallest particles of an element that still have the element's properties are

• quarks

• gluons

• protons

• atoms

Which statement is true about any element?

• It has a unique set of properties
• It is different from all other elements
• It can be identified on the basis of its properties
• all of the above

Tags

NGSS.HS-PS1-1

A unique substance that forms when two or more elements combine chemically is a(n)

• mixture
• colloid
• compound
• solution

A heterogeneous mixture has the same composition throughout.

• true
• false

One example of a homogenous mixture is salt dissolving into water.

• true
• false

The mass number of an atoms is its number of <br />

• electrons
• protons
• neutrons
• protons plus neutrons

Which statement is true about the nucleus of an atom?

• It makes up most of the atoms mass.
• It makes up most of the atom's volume.
• It contains protons and electrons.
• It is neutral in electric charge.

Tags

NGSS.HS-PS1-8

All protons are exactly the same.

• true
• false

Electrons have the same mass as protons.

• true
• false

Which statement is not part of the original atomic theory?

• Atoms consist of smaller particles of matter.
• Atoms cannot be created or destroyed.
• All atoms of the same element have the same mass.
• Atoms join together to form compounds.

Tags

NGSS.HS-PS1-7