END OF MODULE 3 TEST

Front

What is the average atomic mass of an element with isotopes?

Back

The average atomic mass is calculated by multiplying the relative mass of each isotope by its abundance (as a fraction), summing these values, and then dividing by the total abundance.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

How do you determine the identity of an element from its atomic mass?

Back

You can identify an element by comparing its average atomic mass to the atomic masses listed on the periodic table.

Front

What happens during positron decay?

Back

In positron decay, a proton in the nucleus is transformed into a neutron, emitting a positron and a neutrino.

Front

What is the significance of the number of protons in an atom?

Back

The number of protons determines the identity of the element and its position on the periodic table.

Front

What type of nuclear radiation can be stopped by a sheet of paper?

Back

Alpha radiation can be stopped by a sheet of paper.

Front

Who is considered one of the founders of the ancient atomist theory?

Back

Democritus is considered one of the founders of the ancient atomist theory.

Front

What is the relationship between protons and neutrons in an atom?

Back

Protons and neutrons are both found in the nucleus of an atom and contribute to its mass; the number of protons defines the element, while neutrons can vary in isotopes.

Front

What is the role of abundance in calculating average atomic mass?

Back

Abundance indicates how common each isotope is, and it is used to weight the contribution of each isotope's mass to the average atomic mass.

Front

What is alpha radiation?

Back

Alpha radiation consists of helium nuclei (2 protons and 2 neutrons) and is a type of ionizing radiation.