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Dive into the world of elements with H2O, NaCl, and CO2 formulas. Learn about trends like atomic radius changes and properties in groups and periods. Discover the reactivity of different element groups and understand how changing protons, electrons, or neutrons affects elements.
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H2O, NaCl, and CO2 are correct formulas. Predict Rb & S ; Si & O
-Rb2S -SiO2
How is the modern periodic table arranged?
What happens to boiling and melting points as you go down a group?
There is NO Predictable pattern.
-Similar properties -ox.#’s are the same.
What happens if you change: A) protons? B) electrons? C) neutrons?
A) you get a different element. B) you get an ion (Na+ or Cl-) C) you get isotopes (U235 and U238)
Describe periods and groups on the periodic table.
Periods- run left to right or across the periodic table. Groups- run up and down
Most- IA/ Alkali metals Least- VIII/ Noble gases
What elements are in period 1?
List the common names for groups. IA- VII B- IIA- VIII-
IA- alkali metals IIA- Alkaline earth metals VIIB- Halogens VIII- Noble gases
Give the trend for atomic radius.. -left to right -top to bottom?
Left to right- decreases Top to bottom- increases