Quest Flashcards
What did Mendeleev do
Created periodic table by organizing elements by increasing ATOMIC MASS
Similar properties were grouped together
T or F, mendeleevs periodic table had some discrepancies
True, however he could predict properties of undiscovered elements
What did Henry Mosley do
Organized elements by INCREASING ATOMIC NUMBER in his periodic table, resolved mendeleevs discrepancies
Which way does a period go
Which way do columns, groups, families go
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Where are metals located
Left side besides hydrogen
Where are non metals located
Right side
Where are metalloids located
In the diagonal piece
Most metallic and gaseous
Metallic-francium
Gaseous- hydrogen
Increase metallic property
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Alkali metals
Group one
Alkaline earth metals
Group two
Transition metals
Body section
Halogens
Group next to Nobel gases
Nobel gases
Last group
Noble gases
Stable octet- full valence
Colorless gases
Monatomic-come alone very unreactive
Alkali earth metal
One electron valence Very reactive Form ionic compounds with non metals Form insoluble salts with silver Diatomic (exists in pairs)
What are gases at SATP
Fluorine and chlorine
What are liquid at SATP
Bromine
What are solids at SATP
Iodine and astatine
T or F, SATP states can be found on chem helper
TRUEEEE
Periodic law
When elements are arranged in order of increasing atomic number, elements with similar properties appear of regular intervals
How is atomic radius calculated
Distance between two nuclei divided by two
Cations
Positive.
Lose electrons
Smaller atomic radius
Anions
Negative
Gain electrons
Larger atomic radius
Atomic radius across periods and down groups
Across period- decreases
Down groups- increases
Ionization across periods and down groups
Across periods- increases
Down groups- decreases
Electronegativity across periods and down groups
Across periods- increases
Down groups- decreases
Ionization energy
The energy required to remove an electron from an gaseous atom
Why is an atom with high ionization not likely to form positive ion
Strong hold on electrons so it’s not likely to lose an electron
Octet rule
Atoms tend to gain, lose, or share electrons in order to get a full valence outer shell
Electronegativity
Atoms ability to attract electrons in a chemical bond
What is the relationship between attractive force and number of protons and electrons
The attractive force of the nucleus is not divided up amount electrons of the atom, each electron gets the full attractive force of the nucleus
Octaves
Properties of the elements repeated every eight elements
Periodic law
When elements are arranged according to increasing atomic number, there is a periodic repetition of their chemical and physical properties
Similar chemical properties are located
Down a group
Similar chemical properties down a group because
They have the same number of valence electrons
Energy level of valence electron related to period
Period number is the number of the energy level the valence electrons are on
Coloumbic attraction
Attraction between oppositely charged particles
Halogens
Seven valence Very reactive Non metals Form ionic compounds with metals Diatomic
Atomic radius
Electronegativity
Ionization trends
Atomic radius increases down and decreases to the right
Others are inverse
