ACA Unit 1 Atomic Structure

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, calculated as the sum of protons and neutrons in the nucleus.

Front

How do you calculate average atomic mass from isotopic abundance?

Back

Average atomic mass = (fraction of isotope 1 * atomic mass of isotope 1) + (fraction of isotope 2 * atomic mass of isotope 2) + ...

Front

What did Rutherford's gold foil experiment reveal about atomic structure?

Back

Rutherford concluded that atoms are mostly empty space with a small, dense nucleus.

Front

What determines the chemical properties of an element?

Back

The number of protons in an atom determines the chemical properties of an element.

Front

What is true for a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

Define protons.

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

Define neutrons.

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Front

Define electrons.

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

What is the significance of isotopes?

Back

Isotopes are variants of an element that have the same number of protons but different numbers of neutrons, affecting their atomic mass.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons, and is responsible for most of the atom's mass.