Chem Q's 1,2,&3 Flashcards
sxx;lhjnxcds
Who was Dmitri Mendeleev?
Russain, a genuis, how created the periodic table in 1865
What two ways did Mendeleev order the periodic table?
- Ordered elements by increassing mass (average atomic mass)
- Grouped eleemnts into colums by similar properties
What are the five ways the periodic table is orginized today?
- by increasing order of atomic #
- for the most part, by increasing order of average atomic mass (not 100% true)
- by vertical colums called “gropus” (elements with similar properties)
- metals on the left, nometals on the right
- where electrons are located on the atom
What are the three types of elements?
- Metals
- Nonmetals
- Metalloids
What are metals? (6)
- solids (2 exeptions)
- have high melting point
- shiny
- good conductors of heat and electricty
- malleable (flatten out into sheets)
- ductile (pull into wire)
Nonmeals (4)
- gases or brittle soilds (1 liquid)
- low melting points
- dull
- poor conductors of heat and electricty
Metalloids
elements that share properties of both metals and nonmetals ex: boron
located on the stair steps
What are the lanthanide series?
- elements with atomic #’s 58-71 (near the bottom of the peroidc table)
- soft metals that are somewhat rare on earth
- all natural, but 1 man-made
What is group 1?
Alkali metals
What are the actinide series?
- elemenst with atomic #’s 90-103 (at bottom of periodic table)
- radioactive metals
- most mand-made, 3 are natural
What are the noble gasses?
- “Snobby elements”
- They don’t react or combine with other elements
- gasses
- easily change into plasma when electrified
What are three similarities between e’s and planets?
- both planets and e’s travel on levels
- both orbit a larger object
- both are in constant motion
What are some differances between e’s and planets? (3)
- gravity holds planets around the Sun, while opposite charges hold e’s around the nucleus
- e’s can jump levels, while planets can’t
- planets travel an established orbit arounf the Sun, while e’s travel randomly on thir energy level aroubf the nucleus
What are two properties to e’s closer to the Nuc?
less energy
more attracted to the nuc
What are three properties of e’s farther away from the nuc?
- more energy
- less attarted to nuc
- easier for e’s tp jump out of the atom
What is a neutral atom?
an atom that has the same # of por & e’s, “neutral” electric charge
Does the number of e’s ever change?
the # of pro stay that same for an elements but the # of electrons can change
What do atoms what when it comes to stablility and neutrality?
to be stabel, not nuetral
What are the two ways an atom can become stable?
8 outside electrons
full outer energy level; He
Which group has 8 outside electrons?
nobel gasses
