How is it possible for two samples of hydrogen to contain the same number of atoms yet have different weights?
What will be an ideal response?
Isotopes are atoms with the same number of protons but different numbers of neutrons. Hydrogen has three isotopes: hydrogen-1, with a mass number of 1; deuterium, with a mass number of 2; and tritium, with a mass number of 3. The mass number is greater in each isotope because the atoms contain an increasing number of neutrons. The heavier hydrogen sample must contain a higher proportion of one or both of the heavier isotopes.
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a. True b. False Indicate whether the statement is true or false
Muscles can be classified based on their shape and fascicle orientation. Which shape has muscle fibers that run the length of the muscle and taper at each end?
A. Fusiform B. Pennate C. Multipennate D. Circular
What are Peyer's patches?
A) goblet cells B) aggregated lymphoid nodules C) brush border D) duodenal glands
In mammals, the midbrain can be grouped together with the pons and medulla oblongata, and is called the __________
Fill in the blank with the correct word.