The Mass Number of an Isotope of an Element Is

question 47

Multiple Choice

The mass number of an isotope of an element is the

• A)sum of the number of its protons and electrons.
• B)number of its protons.
• C)sum of the number of its protons and neutrons.
• D)sum of the number of its protons,neutrons,and electrons.

---

Definitions:

Two Hundred Million

Indicates a numerical quantity, often used in geological contexts to denote age, such as 200 million years ago.

Submarine Canyons

Deep, steep-sided valleys cut into the seabed of the continental slope, often extending well beyond the depth of the surrounding ocean floor.

Oceanic Plateau

Elevated regions of the ocean floor, characterized by a relatively flat topography, and often formed by volcanism or large igneous provinces.

Back-Arc Spreading

The formation of new oceanic crust behind a volcanic arc, resulting from the divergent movement of plates at a convergent boundary, a reiteration emphasizing plate tectonic mechanisms.