chem unit 5 test

Question Answer
who first described periodic trends mendeleev
what did mendeleev develop the periodic table before the discovery of proton
what are elements arranged by increasing atomic #
what is each row called period
why do the number of elements per period vary number of available orbitals increases from energy level to energy level
what is each column called group/ family
what do the elements in a group have similar electron configuration
what does the electron configuration determine chemical properties
what is the pattern of repeating properties in the periodic table called periodic law
how many electrons can fit in each energy level 2, 8, 18, 32
what is a lewis structure simplified model to represent just valence electrons
why is a lewis structure useful only valence electrons are used in bonds
steps for a lewis structure 1. write element symbol2. determine # of valence3. draw electrons around symbol like clock
describe hydrogen least dense, floats in air, nonmetal
where are the alkali metals found group 1
where are the alkaline earth metals found group 2
where are the transition metals found group 3-12
where are the rare earth metals found bottom of table in 2 rows
what are the top/ bottom row of the rare earth metals called lathanides/ actinides
what elements are non metals first in group 14, first 2 in group 15, first 3 in group 16, first 5 in group 17
where does the staircase that separates the metals from the nonmetals run through the metalloids
where are the noble gases group 18
when are elements classified as solid, liquid, or gas room temperature
how can elements occur naturally or unnaturally
what are metals good conductors of electric current/ heat
what are metals at room temperature solid except for mercury
what are 2 common properties of metals malleable/ ductile
what were the first discovered elements transition metals
compare nonmetals to metals opposite
can non metals conduct heat/ electric current no
what are many non metals at room temperature and what is their boiling point gas/ low
what happens if a nonmetal is solid at room temperature brittle
what are the properties of metalloids properties between metals/ non metals depending on temperature
what elements are metalloids b, si, ge, as, sb, te, po
what is the atomic radius distance from the center of an atoms nucleus to its outer most (valence) electron
what is happening to the atomic radius as you move from the top to the bottom # of energy levels increases as you move down the group as the # of electrons increases, so each level gets further away from the nucleus and atomic radius increases
what happens to atomic radius as you move from the left to right across the period electrons are added to the same energy level; at the same time, protons are being added to the nucleus so there is a stronger force of attraction pulling the electrons closer to the nucleus, resulting in a smaller radius
what is ionization energy required to remove an electron from an atom or ion
what is happening to ionization energy as you move from the top of the group to the bottom electrons are further from the nucleus so they're easier to remove
what is happening to ionization energy as you move from the left to the right across the period atomic radius decreases so outer electrons are closer and more stronger attracted to center so they are harder to remove (more energy)
what is electronegativity measure of an atom's attraction for electrons in a chemical bond
what is happening to electronegativity as you move from the top to the bottom decreases because the bonding pair is increasingly further away from the attraction of the nucleus
what is happening to electronegativity as you move from left to right increases because the atomic radius decreases and force of attraction increases
what is the electronegativity of noble gases none
what is the periodic law properties of elements repeat in a predictable way when atomic #s are used to arrange elements in groups based on electron configuration
what 2 factors determine mass of an element protons/ neutrons
what are the 3 categories used to classify elements metals, nonmetals, metalloids
what changes as you move left to right across the periodic table elements become less metallic
why can't a new element have an atomic # less than 100 2 elements can't have the same number of protons
why do elements in a group have similar properties electron configuration
what is the relationship between an alkali metal's location in group 1a and its reactivity reactivity increases since you go down since ionization energy is decreasing
what element exists in almost every compound of your body carbon
what group of elements is the least reactive noble gases
why is hydrogen in a group with reactive metals same electron configuration
where are metalloids located staircase
how many groups are on the periodic table 18
what is the name of the 17th group halogens
how many periods are in the periodic table 7
describe luster in metals v. nonmetals metals have luster
how is the energy level of an elements valence electrons related to its period on the periodic table energy level indicates the period

Leave a Reply

Your email address will not be published. Required fields are marked *