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Transcript of Periodic Table
properties. 2. The succession of elements across the same period demonstrates characteristic trends: differences in atomic radius, ionic radius, electronegativity, first ionization energy, metallic/nonmetallic
properties. 3. Trends Across a Period
Each horizontal row of the periodic table is called a period. There are seven periods in the modern periodic table. The number of elements per period ranges from 2 (H, He) in period 1, to 32 in period 6.
Atomic radius- atomic size decreases across a period from left to right
Ionization Energy-increases from left to right across a period
Electronegativity- Increases across a period Electronegativity increases, atomic decreases, ionization energy decreases Reactivity increases, ionization energy increases, Electronegaivity decreases 4. Trends Down A Group
Each vertical column is called a group or family. Elements within a group have similar chemical and physical properties.
Atomic radius- down a group atomic radius increases, the charge on the nucleus increases and the number of occupied energy levels increases
Ionization energy- tends to decrease from top to bottom, less energy is required to remove an electron from the highest energy level and the first ionization energy is lower.
Electronegativity- Values decrease from top to bottom
ends Down a Group Real World Connectios:
Add elements from the first
group they explode
Salt with ice- ice melts