Answer :
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The left to right order of elements in the periodic table is based on their **B) atomic number**. Atomic number is the number of protons found in the nucleus of an atom. Here's why this is important in determining the order of elements:
1. **Atomic Number**: Elements are arranged in increasing order of atomic number from left to right in the periodic table. For example, hydrogen has an atomic number of 1, helium has an atomic number of 2, and so on.
2. **Periodic Table Structure**: The periodic table is organized into periods (rows) and groups (columns). Elements within the same period have the same number of electron shells, while elements in the same group have similar chemical properties due to the same number of valence electrons.
3. **Trends**: Moving from left to right across a period, the atomic number increases, leading to a gradual change in the properties of elements. This arrangement helps in predicting properties such as reactivity, atomic size, and electronegativity.
Understanding the significance of atomic number in the periodic table's arrangement is crucial for grasping the trends and patterns exhibited by elements. This knowledge can aid in predicting behaviors and characteristics of elements based on their position in the table.
