4.3 The Atom

Open Ended

What is the Learning Goal?

Fill in the Blanks

The atom is the

particle of an element.

Multiple Choice

The idea of atoms did not become scientific theory until

• 1708.

• 1808.

• 1908.

• 2008.

Open Ended

Who developed an atomic theory that proposed that atoms were responsible for the combinations of elements found in compounds?

Fill in the Blanks

Atoms are the

blocks of everything around us.

Multiple Choice

Atoms are too small to see.

• This statement is FALSE.

• This statement is TRUE.

Match

Match the following

• two positive charges

• two negative charges

• positive and a negative charge

Repel

Repel

Attract

• Repel

• Repel

• Attract

Multiple Choice

In 1897, J.J. Thomson discovered that cathode rays were streams of negatively charged particles called

• protons.

• neutrons.

• electrons.

• quarks.

Match

Match the following

• proton

• electron

• neutron

Positive charge

Negative charge

No charge

• Positive charge

• Negative charge

• No charge

Multiple Choice

Chemists use the __ to indicate the mass of an atom.

• Da

• amu

Multiple Choice

Mass of the atom are due to the ___ in the nucleus.

• electrons and protons

• protons and neutrons

• neutrons and electrons

• just electrons

• just protons

Match

Match the following

• 1+

• 0

• 1-

• nucleus

• outside nucleus

p+

n

e-

Proton

electron

• p+

• n

• e-

• Proton

• electron