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In the periodic table, what is the last element (highest atomic number) in Period 4?
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4. Atoms and Elements
Periodic Table: Classifications
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In the periodic table, what are the horizontal rows called?
A
Blocks
B
Periods
C
Families
D
Groups
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Understand that the periodic table is organized in two main directions: horizontally and vertically.
Recognize that the horizontal rows in the periodic table are called 'Periods'.
Know that each period corresponds to the filling of a different electron shell or energy level in atoms.
Differentiate between horizontal rows (Periods) and vertical columns, which are called 'Groups' or 'Families'.
Remember that 'Blocks' refer to sections of the periodic table based on electron subshells (s, p, d, f), not rows or columns.
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