Explanation:
atomic number;number of protons in an atom of an element.
mass number ;number of nucleons ( neutrons) in an atom of an element.
Answer:
The correct answer is periods. See the explanation below, please.
Explanation:
The horizontal lines in the periodic table are called periods (ranging from 1 to 7) and vertical lines (ranging from 1 to 18).
The period that an element belongs to coincides with the last electronic layer of the element (that compound in period 3 will have 2 electronic layers).
Answer:
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It has the same composition throughout, unlike a heterogeneous which has visibly separate substances
