Atomic Structure

What subatomic particles make up the nucleus of an atom?

• Electron and Proton

• Electron and Neutron

• Proton and Neutron

• Proton only

The atomic theory states that matter is made up of what?

• Atom

• Corpucles

• Earth and air

• Elements

If an atom has more electrons than protons then it has a what?

• Neutral charge

• Negative charge

• No charge

• Positive charge

What do you call an atom which has the same number of protons and electrons?

• Ion

• Isotope

• Molecule

• Neutral atom

Democritus coined the term "atomos" which means?

• Divisible

• Invincible

• Invisible

• Uncuttable

Which of the following is TRUE about an atom?

• All matter is made up of it.

• It is the smallest particle of an element.

• It is made up of protons, electrons, and neutrons.

• All of the above.

Who discovered electron?

• John Dalton

• Ernest Rutherford

• James Chadwick

• J.J. Thompson

Who discovered neutron?

• John Dalton

• Ernest Rutherford

• James Chadwick

• J.J. Thompson

Which of the following models of an atom shows electrons orbiting the nucleus?

• Nuclear Model

• Planetary Model

• Plum Pudding Model

• Quantum Mechanical Model

The discovery of isotopes contradicted what postulate of Dalton's theory?

• All atoms of a given element are alike.

• All matter are made up of atoms.

• Atoms may break apart into separate atoms, but the atoms themselves are unchanged.

• When atoms form molecules, they unite in small whole numbered ratios.