Ch.4 Atomic Structure (Physical Science)

Front

What do scientists use to predict the locations of electrons in atoms?

Back

Probability

Front

What did Democritus believe about matter?

Back

Matter is made of tiny particles that could not be divided.

Front

What did J.J. Thomson's experiments reveal about atoms?

Back

Atoms contain negatively charged particles.

Front

In Rutherford's gold foil experiment, what do alpha particles that bounce straight back from the foil strike?

Back

Nuclei in the gold atoms.

Front

What is the state of an atom when an electron has moved to a higher energy level?

Back

Excited state.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element.