ch. 17 Flashcards
(23 cards)
how did mendeleev arrange his periodic table?
by increasing the mass
In a periodic table a set of properties repeats from ____ to ____
row to row
what is eka-aluminum? how did it get its name?
Gallium, it had similar properties to alluminum
the atomic mass of a unit is based off what element/isotope?
carbon-12
what is atomic mass?
Z=, sum of protons and nucleus
what are alkali metals, what are earth metals ?
1A, highly reactive. 2A, 2nd most reactive
grp 7A contains the ____, are they reactive or unreactive?
Halogens, highly reactive
atoms of the most reactive elements tend to have how many valence electrons?
7 or/to 1
what gives an element the tendency to react?
number of valence electrons.
elements are more reactive from ___ to ___ in a column on the periodic table
top, bottom
to keep reacting, elements are stored in ____
Argon
what element is found in nature only in compounds
Sodium
what element is found in your body that contains most compounds
carbon
elements in the same ____ share similar properties
group, family, column
how was mandeleevs periodic table useful?
explain and predict
what is the most abundent METAL found in the earths crust
aluminum
what is the most abundent ELEMENT found in the earths crust
oxygen
what is the 2nd most abundent element found in the earths crust
silicon
what determines an elements chemical properties
number of valence electrons
what are the 3 grp elements classified as
metal, nonmetal, and metalloids
what grp of elements are colorless, ordorless, and unreactive
8A, Noble Gases
how many valence electrons does helium have
2
list the grps in order
1A-Alkali metals
2A-Alkaline metals (earth)
3A-boron family
3-12B-transition metals
4A-carbon family
5A-nitrogen family
6A-oxygen family (chalogens)
7A-halogens
8A- Nobel gases
