Understanding Atoms Chemistry

Which of the following determined that cathode rays are negatively charged?

• Aristotle

• Dalton

• Rutherford

• Thomson

In an atom, electrons ____.

• are located in the nucleus

• are paired with neutrons

• travel outside the nucleus

• are always in the same place in an atom

Who proposed this model of atoms?

• Dalton

• Democritus

• Rutherford

• Thomson

Which scientist developed this model for atoms?

• Dalton

• Democritus

• Rutherford

• Thomson

The energy levels of an atom are occupied by _____.

• electrons

• protons

• neutrons

• ions

Tags

NGSS.HS-PS1-1

The nucleus of an atom consists of _________________________.

• electrons

• neutrons

• protons and neutrons

• protons, neutrons, and electrons

Tags

NGSS.HS-PS1-8

The three basic components of an atom are _______________.

• protons, neutrons, and ions

• protons, neutrons, and electrons

• protons, neutrinos, and ions

• protium, deuterium, and tritium

If two atoms have the same number of protons but different numbers of neutrons, they will have the same ____.

• half-life

• mass number

• atomic number

• degree of stability

Which of the following statements about the atom is false?

• Each atom has a tiny nucleus at its center.

• All the protons and neutrons are located in the nucleus.

• Electrons travel in definite circular pathways around the nucleus.

• All atomic nuclei are positively charged.

Tags

NGSS.HS-PS1-8

What was on the photographic plate in Becquerel’s drawer with the uranium?

• an image of the mineral

• a sun spot

• Becquerel's fingerprints

• Nothing. It was clean.