Atomic Theory_3a.

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tompson
• Ernest Rutherford
• John Dalton
• Democritus

Who used this model to explain the identity of a subatomic particle of an atom.

• J.J. Thompson
• Ernest Rutherford
• Neils Bohr
• James Chadwick

Which scientist discovered that electrons are in energy levels around the nucleus of an atom.

• Bohr
• Dalton
• Rutherford
• Heisenberg

Rutherford also concluded that:

• most of the mass of atom is in the nucleus
• electrons repel electrons
• atoms combine in whole number ratios to form compounds
• all of the above

The Gold Foil Experiment used by ______________determined _____________

• Rutherford, atoms have big nuclei
• Thompson, electrons conduct electricity
• Rutherford, atoms are mostly empty space
• Thompson, atoms can be radioactive

Which particle has a positive charge?

• electron
• orbital
• proton
• neutron

Choose the particle that has no charge.

• nucleus
• neutron
• proton
• electron

An electron has a _____ charge.

• negative
• positive
• neutral

Tags

NGSS.HS-PS2-4

What are valence electrons?

• electrons on the first orbital always
• nucleus
• the outermost shell
• the number of electrons on the outermost orbital

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which particles make up the nucleus of an atom?

• protons and neutrons
• electrons and protons
• electrons, protons, and neutrons
• electrons and neutrons

Tags

NGSS.MS-PS1-1