Front

What is the photoelectric effect?

Back

A phenomenon where electrons are emitted from a metal’s surface when light of a certain frequency shines on it.

Front

How is the atomic mass of an element calculated?

Back

By averaging the mass numbers of all isotopes.

Front

What is the mass number of an atom with 6 protons, 6 neutrons, and 6 electrons?

Back

12

Front

What is the nucleus of an atom?

Back

The positively charged center of an atom.

Front

How does the quantum mechanical model of the atom treat electrons?

Back

As waves with probabilistic locations.

Front

What is the definition of atomic number?

Back

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

Front

What is an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the difference between mass number and atomic mass?

Back

Mass number is the total number of protons and neutrons, while atomic mass is the weighted average of all isotopes of an element.

Front

What is blackbody radiation?

Back

The electromagnetic radiation emitted by a body in thermal equilibrium.

Front

What is gamma radiation?

Back

High-energy electromagnetic radiation emitted during radioactive decay.