What Is an Atom

The Atomic Theory: Atoms of different elements are _________.

• atoms

• alike

• different

• chemical

• physical

What does letter D represent?

• nucleus

• proton

• neutron

• electron

• electron cloud

Tags

NGSS.MS-PS1-1

What does letter E represent?

• nucleus

• proton

• neutron

• electron

• electron cloud

Tags

NGSS.MS-PS1-1

Which particles are in the nucleus? Choose all that apply.

• proton

• neutron

• electron

Who created the modern day Atomic Theory in the early 1800s?

• Demetry Mendeleyev

• John Dalton

• Democritus

What does letter A represent?

• nucleus

• proton

• neutron

• electron

• electron cloud

Tags

NGSS.MS-PS1-1

In an atom, the number of protons is equal to the number of electrons.

• True

• False

Tags

NGSS.MS-PS1-1

What is the smallest unit of an element that retains the properties of that element?

• Atom

• Molecule

• Compound

• Mixture

Which subatomic particle has a positive charge?

• Electron

• Proton

• Neutron

• Photon

What is the central part of an atom called?

• Electron cloud

• Nucleus

• Proton

• Neutron