If atom X has an atomic number of 74 it would have which of the following?
37 protons and 37 neutrons
37 protons and 37 electrons
74 protons
74 neutrons
The Correct Answer is C
A. 37 protons and 37 neutrons: The atomic number defines the number of protons, so an atomic number of 74 corresponds to 74 protons, not 37. Neutron number can vary depending on the isotope.
B. 37 protons and 37 electrons: Similarly, the number of protons equals the atomic number, which is 74 in this case. Electrons in a neutral atom also equal 74, not 37.
C. 74 protons: The atomic number of an element specifies the number of protons in its nucleus. Therefore, an atom with an atomic number of 74 has 74 protons.
D. 74 neutrons: Neutron number is not directly determined by the atomic number; it varies among isotopes. The atomic number only defines the number of protons.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cervical region: The cervical region (neck) is part of the axial division, which includes the head, neck, and trunk.
B. Organs of the female reproductive system: These are found within the pelvic cavity, which is part of theaxial body.
C. Carpal region: The carpal region refers to the wrist, which is part of the appendicular division of the body (limbs). It is not included in the axial division.
D. Body cavities: Major body cavities, including the cranial, thoracic, and abdominopelvic cavities, are part of the axial division, providing structural support and housing vital organs.
Correct Answer is C
Explanation
A. A long fatty acid chains: Triglycerides with long fatty acid chains can be either saturated or unsaturated. The chain length affects melting point to some extent but does not solely determine whether the fat is a solid or liquid at room temperature.
B. Saturated fatty acids: Saturated triglycerides have no double bonds, making their fatty acid chains tightly packed. This structure leads to higher melting points, so they are generally solid at room temperature, as seen in butter or lard.
C. Unsaturated fatty acids: Unsaturated triglycerides contain one or more double bonds in their fatty acid chains, which introduce kinks that prevent tight packing. This structure lowers their melting point, making them liquid at room temperature and therefore classified as oils.
D. A high water content: Triglycerides are hydrophobic molecules that do not mix with water. Their classification as oils or fats depends on the degree of saturation of fatty acids, not water content, since triglycerides themselves contain virtually no water.
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