science test study guide

J.J. Thomson's experiments provided evidence that an atom A is the smallest particle of matter B contains negatively charged particles C has a negative charge D has a positive charge

B Contains negatively chargedparticles

Which of the following most accurately represents John Dalton's model of the atom? A A tiny, solid sphere with an unpredictable mass for a given element. B A hollow sphere with a dense nucleus C A tiny, solid sphere with predictable mass for a given element. D A sphere that is hollow throughout

C A tiny, solid sphere with predictable mass for a given element.

Which of the following is NOT part of John Dalton's atomic theory? A All elements are composed B All atoms of the same element have the same mass C Atoms contain subatomic particles D A compound contains atoms of more than one element.

C Atoms contain subatomic particles

Which statement is true about oxygen-17 and oxygen-18? A They do not have the same number of protons B Their atoms have identical mass C They have isotopes of oxygen D They have the same mass number.

C They have isotopes of oxygen

Which statement best describes Rutherford's model of the atom? A It is like an avocado with the pit representing the nucleus. B It is like an aquarium with swimming fish representing positive charges. C It is like a fried egg with the yolk representing positive charges D It is like a huge stadium with a positively charged marble at the center.

D It is like a huge stadium with a positively charged marble at the center.

Which statement about subatomic particles is NOT true A Protons and neutrons have almost the same mass. B Protons and electrons have opposite charges C Unlike protons and electrons, neutrons have no charge. D protons and neutrons have the same charge.

D protons and neutrons have the same charge.

Rutherford's gold foil experiment provided evidence for which of the following statements. A negative and positive charges are spread evenly throughout an atom. B Alpha particles have a positive charge. C Gold is not as dense as previously thought. D there is a dense, positively charged mass in the center of an atom.

D there is a dense, positively charged mass in the center of an atom.

The Greek philosopher Democitus coined what word for a tiny piece of matter that cannot be divided?

atom

In an atomic model that includes a nucleus, positive charge is

concentrated in the center of an atom.

Which subatomic particle has a negative charge?

electron

In Niels Bohr's model of the atom, electrons move

like planets orbiting the sun

the nucleus is made up of ____ and _____.

protons and neutrons

Democritus thought that matter was made of tiny particles

that could not be divided

What does the electron cloud model describe?

the most likely locations of electrons in atoms