Examlex
________,or other questions that require some degree of mental activity,such as evaluating choices,voicing opinions,recalling past experiences,indicating intentions,or responding to"what if"questions,are placed deeper in the survey.
Element
A pure chemical substance consisting of one type of atom, distinguished by its atomic number, which is the number of protons in its nucleus.
Isotope
Atoms of the same element that have different numbers of neutrons in their nuclei, leading to different atomic masses but the same chemical behavior.
Neutrons
Tiny particles located within an atom's nucleus, possessing no electrical charge and having a mass that is marginally higher than protons.
Isotope
Variants of an element that contain the same number of protons but different numbers of neutrons in their nuclei.
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