elements to memorize

Question 1

Alkali metals

Answer 1

-in group 1A or group 1
-metals

2 proporties
-1 valence e-
-very reactive
-low density
-soft

Elements: 3Li, 11Na, 19K, 37Rb, 55Cs, 87Fr

Question 2

Alkaline earth metals

Answer 2

-in group 2A or group 2
-Metals

2 proporties
-2 valence e-
-reactive
-low density

Elements: 4Be, 12Mg, 20Ca, 38Sr, 56Ba, 88Ra

Question 3

Halogens

Answer 3

-in group 7A or group 7
- non-metals

2 proporties
-7 valence e-
- exist in 3 different states of matter
- very active

Elements: 9F, 17Cl, 35Br, 53I,

85At is a halogen but is a metalloid

Question 4

Noble gasses

Answer 4

-in group 8A or group 8
- non-mentals

2 proporties
-8 valence e-
-non-reactive
-colorless or oderless

Elements: 2He, 10Ne, 18Ar, 36Kr, 54Xe, 86Rn