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How Can We Predict Atomic Radius Using Periodic Trends?

To understand atomic radius using the periodic table, here are some important points to remember:

  1. Trends in the Periodic Table:

    • The atomic radius gets smaller as you move from left to right across a row. For example, sodium (Na) has a radius of about 186 picometers (pm), while chlorine (Cl) is smaller at about 99 pm.
    • The atomic radius gets bigger as you go down a column. For instance, lithium (Li) has a radius of about 152 pm, but cesium (Cs) can be as large as 262 pm.

  2. Factors that Affect Atomic Radius:

    • Nuclear Charge: When the nuclear charge is higher, it pulls electrons in closer, which makes the radius smaller.
    • Electron Shielding: More inner electrons can protect outer electrons from the pull of the nucleus, which causes the radius to be bigger as you go down a group.

By keeping these trends in mind, you can predict the size of an atom based on where it is located in the periodic table.

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How Can We Predict Atomic Radius Using Periodic Trends?

To understand atomic radius using the periodic table, here are some important points to remember:

  1. Trends in the Periodic Table:

    • The atomic radius gets smaller as you move from left to right across a row. For example, sodium (Na) has a radius of about 186 picometers (pm), while chlorine (Cl) is smaller at about 99 pm.
    • The atomic radius gets bigger as you go down a column. For instance, lithium (Li) has a radius of about 152 pm, but cesium (Cs) can be as large as 262 pm.

  2. Factors that Affect Atomic Radius:

    • Nuclear Charge: When the nuclear charge is higher, it pulls electrons in closer, which makes the radius smaller.
    • Electron Shielding: More inner electrons can protect outer electrons from the pull of the nucleus, which causes the radius to be bigger as you go down a group.

By keeping these trends in mind, you can predict the size of an atom based on where it is located in the periodic table.

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