A Particular Nucleus of the Element Erbium Contains 68 Protons

question 36

Multiple Choice

A particular nucleus of the element erbium contains 68 protons and 90 neutrons.What is the total number of electrons in the neutral erbium atom?

• A)90
• B)158
• C)22
• D)68
• E)None of the above

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Definitions:

Sympathetic Nervous System

Part of the autonomic nervous system that prepares the body for quick action in emergencies; "fight or flight" response.

Parasympathetic Nervous System

A division of the autonomic nervous system responsible for conserving energy and promoting a state of calm and rest in the body.

Glial Cells

Non-neuronal cells in the central nervous system that support, protect, and provide a supportive framework for neurons.

Brain's Cells

Cells in the brain, including neurons that transmit nerve impulses and glial cells that support and protect neurons.