Atomic Theory & Structure

Which scientist saw the atom as a positively charged sphere with negative particles (electrons) embedded within?

• J.J. Thomson
• Niels Bohr
• John Dalton
• Ernest Rutherford

Tags

NGSS.MS-PS1-1

Which scientist proposed a model of the atom in which the electrons are orbiting at different levels?

• Niels Bohr
• James Chadwick
• John Dalton
• Ernest Rutherford

Which scientist is responsible for first discovering that all the atoms of a particular element are identical but are different from the atoms of all other elements?

• Dalton
• Thomson
• Bohr
• Rutherford

Which scientist used his gold foil experiment to show that an atom has a small, central, positively charged nucleus that contains most of the atom's mass?

• Rutherford
• Bohr
• Thomson
• Dalton

Tags

NGSS.HS-PS1-8

Order the atomic models below from the oldest to the most recent.

• 2, 1, 3, and 4

• 1, 2, 4, and 3

• 3, 2, 4, and 1

• 3, 1, 2, and 4

Tags

NGSS.MS-PS1-1

Which statement is true according to current thinking?

• An atom is mostly empty space.
• An atom is a collection of particles, so tightly packed that there is little empty space.
• The atomic nucleus is very mobile, and moves around inside a cloud of electrons.
• The size of atoms changes over time, pulsating from large to small to large again.

Whose model of an atom is displayed in the picture?

• Thomson
• Rutherford
• Dalton
• Bohr

Tags

NGSS.MS-PS1-1

Whose model of an atom is displayed in the figure?

• Bohr
• Rutherford
• Thomson
• Modern Model

Oxygen-17 has 8 protons and ______ neutrons?

• 8
• 9
• 10
• 7

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron