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