Horizontal periods in modern periodic table?

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Horizontal periods in Modern Periodic Table

Definition:
Horizontal periods in the modern periodic table refer to the rows running from left to right across the table. There are a total of 7 periods in the periodic table.
Characteristics:
Each period represents the energy levels of the elements in that row. As we move from left to right across a period, the atomic number increases, and the elements show a gradual change in properties.
Elements:
Each period corresponds to the number of electron shells in an atom. For example, the first period (Period 1) contains only two elements, hydrogen and helium, which have electrons in the first shell. As we move to Period 2, the elements have electrons in the first and second shells, and so on.
Trends:
Across a period, there are trends in properties such as atomic size, ionization energy, electron affinity, and electronegativity. These trends help in understanding the behavior of elements within a period.
Transition Metals:
The transition metals are located in periods 4, 5, and 6 of the periodic table. These elements exhibit typical metallic properties and show a gradual transition in properties as we move across these periods.