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Which of the Following Standards Is Used by 24 States

question 23

Multiple Choice

Which of the following standards is used by 24 states?


Definitions:

Atomic

Relating to atoms, the smallest constituent unit of ordinary matter that constitutes a chemical element.

Mass Number

The total number of protons and neutrons in an atom's nucleus.

Isotopes

Variants of a particular chemical element that differ in neutron number, and consequently in nucleon number, but have the same number of protons in their nuclei.

Atomic Number

The number of protons found in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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