Select the correct statement about isotopes.
All the isotopes of the same element react differently.
Isotopes occur only in the heavier elements.
All the isotopes of an element have the same number of neutrons but differing numbers of electrons.
Isotopes of the same element have the same atomic number but differ in their atomic mass (weight) number.
The Correct Answer is D
A. All the isotopes of the same element react differently: Isotopes generally exhibit the same chemical behavior because they have the same number of protons and electrons, which determine chemical reactivity.
B. Isotopes occur only in the heavier elements: Isotopes are found in both light and heavy elements; they are variations of an element with differing numbers of neutrons, not limited to heavy elements.
C. All the isotopes of an element have the same number of neutrons but differing numbers of electrons: Isotopes have the same number of protons (and electrons if neutral) but differ in neutron number.
D. Isotopes of the same element have the same atomic number but differ in their atomic mass (weight) number: Isotopes share the same number of protons (atomic number) but have different numbers of neutrons, which changes their mass number.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Help in the formation of cell membranes: Lysosomes do not participate in building cell membranes. Their main role is to digest cellular waste, foreign particles, and damaged organelles, not to synthesize structural components like membranes.
B. Digesting particles taken in by endocytosis: Lysosomes contain hydrolytic enzymes that break down materials brought into the cell via endocytosis, helping the cell recycle nutrients and eliminate debris.
C. Degrading worn-out or nonfunctional organelles: Lysosomes perform autophagy, digesting damaged or obsolete organelles to maintain cellular health and prevent accumulation of dysfunctional components.
D. Breaking down bone to release calcium ions into the blood: Specialized lysosomes in osteoclasts secrete enzymes that degrade bone matrix, releasing calcium and phosphate ions into circulation, which is part of normal bone remodeling.
Correct Answer is D
Explanation
A. NaOH: Sodium hydroxide is an inorganic compound because it does not contain carbon-hydrogen bonds. It is a strong base used in many chemical processes but is not classified as organic.
B. NaCl: Sodium chloride is an ionic compound formed from sodium and chlorine ions. It lacks carbon altogether, making it an inorganic molecule rather than an organic one.
C. H2O: Water is vital for life and serves as a universal solvent, but it is a simple molecule without carbon. Since organic molecules require carbon, water is inorganic.
D. CH4: Methane (CH4) is an organic molecule because it consists of carbon bonded to hydrogen atoms. The presence of carbon-hydrogen bonds defines it as organic.
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