An Element Has an Atomic Number of 78

question 14

Multiple Choice

An element has an atomic number of 78. The number of protons and electrons in a neutral atom of the element are

• A) 156 protons and 78 electrons.
• B) 39 protons and 39 electrons.
• C) 78 protons and 0 electrons.
• D) 78 protons and 78 electrons.
• E) 78 protons and 39 electrons.

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Definitions:

Reticular Formation

A network of neurons in the brainstem involved in consciousness, sleep-wake cycles, and filtering incoming stimuli to discriminate irrelevant background information.

Sodium

Sodium is a chemical element with the symbol Na and atomic number 11, essential for human health in small amounts but often discussed in the context of dietary intake and health effects.

Membrane

A selective barrier that permits the passage of certain substances while blocking others.

Resting Potential

The electrical potential of a neuron when it is not actively transmitting a signal, representing a state of readiness for activation.