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Trends in the Periodic Table

Trends in the Periodic Table. Trends in Mass. As you move from left to right across a period, mass increases As you move from top to bottom down a group, mass increases Masses get larger in both these cases as the atoms have more protons, neutrons and electrons. Trends in Atomic Radius.

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Trends in the Periodic Table

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  1. Trends in the Periodic Table

  2. Trends in Mass • As you move from left to right across a period, mass increases • As you move from top to bottom down a group, mass increases • Masses get larger in both these cases as the atoms have more protons, neutrons and electrons

  3. Trends in Atomic Radius • As you move from left to right across a period atomic radius DECREASES!! • This is because the electrons are “pulled in” closer to the nucleus as the number of protons increases….the atom “shrinks” in a bit. • See graph on p. 23

  4. Trends in Atomic Radius • As you move from top to bottom down a group, atomic radius INCREASES as the atoms have more electron shells.

  5. Trends in Reactivity for Metals • As you move from left to right across a period, reactivity decreases for metals • As you move from top to bottom down a group, reactivity increases for metals The most reactive metal is francium (Fr)

  6. Trends in Reactivity for Non-metals • As you move from left to right across a period, reactivity for non-metals increases • As you move from top to bottom down a group, reactivity for non-metals decreases. • Remember the noble gases are NON-REACTIVE, so the most reactive non-metal is fluorine (F)

  7. Trends in Ionization Energy • Ionization energy is the energy required to remove the outermost electron from an atom • Ionization energy increases across a period and decreases down a group

  8. Trends in Ionization Energy

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