9th Atomic Models and Discoveries Quiz

According to Democritus, atoms are:

• Indivisible particles

• Made of discrete particles

• Continuously divisible

• Made of positively charged material with embedded electrons

What did Aristotle believe about matter?

• It is continuous and not made of discrete particles

• It is made of indivisible particles

• It can be subdivided into small, whole number ratios

• It is made of negatively charged particles

According to John Dalton, atoms of an element are:

• All alike

• Different from the atoms of all other elements

• Made of positively charged material with embedded electrons

• Continuously divisible

What did scientists discover about electrical charges by the end of the 1700s?

• There are two forms of electrical charge - positive and negative

• Opposite charges attract each other

• Like charges repel each other

• All of the above

Who theorized the existence of electrons?

• J. J. Thomson

• Hantaro Nagaoka

• Ernest Rutherford

• Niels Bohr

What is the plum pudding model?

• Atoms are spheres of positively charged material with embedded electrons

• Atoms consist of a massive, positively charged center surrounded by a flat ring of electrons

• Atoms have hooks to hold them together and are slippery

• Atoms are made up of a tiny, dense, positively charged central nucleus surrounded by negatively charged electrons

According to Ernest Rutherford's experiments, where is most of an atom's mass and positive charge located?

• In the nucleus

• In the orbitals

• In the energy levels

• In the positively charged material with embedded electrons

Tags

NGSS.HS-PS1-8

What is the currently accepted atomic model?

• Quantum-mechanical model

• Plum pudding model

• Saturnian model

• Bohr model

What are orbitals in the quantum-mechanical model?

• Oddly-shaped areas where electrons are likely to be found

• Spheres of positively charged material with embedded electrons

• Hooks that hold atoms together

• Distinct spherical regions where electrons travel at fixed distances from the nucleus

Which atomic model includes electrons orbiting the nucleus at specific levels?

• Bohr model

• Plum pudding model

• Saturnian model

• Quantum-mechanical model