resources a 2 flashcards pp. 103-106
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Resources A 2 Flashcards pp. 103-106. H 2 O, NaCl, and CO 2 are correct formulas. Predict Rb & S ; Si & O. -Rb 2 S -SiO 2. How is the modern periodic table arranged?. By Atomic #. What happens to boiling and melting points as you go down a group?. There is NO Predictable pattern. - PowerPoint PPT PresentationTRANSCRIPT
Resources A 2 Flashcardspp. 103-106
H2O, NaCl, and CO2 are correct formulas. Predict
Rb & S ; Si & O
-Rb2S
-SiO2
How is the modern
periodic table
arranged?
By Atomic #
What happens to boiling and melting points as you go down a group?
There is NO
Predictable
pattern.
What do elements in a group have in common??
Example??
-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
Which group is the most reactive and least reactive?
Most- IA/ Alkali metals
Least- VIII/ Noble gases
What elements
are in period 1?
-H and He
List the common names for groups.
IA- VII B-
IIA- VIII-
IA- alkali metals
IIA- Alkaline earth metals
VIIB- Halogens
VIII- Noble gases
What elements are in IIA?
-Be Thru Ra
If the B. pts of Li=100 and K=50 then Na would be…
N= 75
Give the trend for atomic radius..
-left to right
-top to bottom?
Left to right- decreases
Top to bottom- increases