Exam 2 Review

you have a new element "samanthium" (Sa), it has 56 protons and 65 neutrons. how much does one atom of Sa weigh in grams?

121g

give the molecular formula and name the compound of Al +3 and S-2

Al2S3 and aluminum sulfide

rank the atoms Br,Cl,F in order of increasing electronegativity

Br,Cl,F

give the molecular formula and name the compound of Ca2+ and O2-

CaO and calcium oxide

what is the ion symbol for an atom with 20 protons and 18 electrons a) Ar-2 b)Ca c) Ca+2 d) Ar

c) Ca+2

the electronic configuration of chlorine is 1s2,2s2,2p6,3s2,3p5. which statement is FALSE? a) Cl has 17 electrons b) Cl has 5 electrons in the 3p sub shell c) Cl has 5 valence electrons d) Cl valence shell is the third shell

c) Cl has 5 valence electrons it actually has 7

name the ion and determine whether anion or cation Cr2+

chromium (II) and cation

which of the following statements is FALSE? a) elements in the same group have the same number of valence electrons b)isotopes of the same element have the same number of electrons c) group 6a elements have the general electron configuration of ns2np4 d) the electronic configuration for calcium is 1s12s22p63s22p64s2 e) the electronic configuration of aluminum using noble gas notation is [Ne] 3s23p1 d) all are true

d) all are true

the chemical reactivity of an element is determined by which of the following? a) number of neutrons in an atom b) number of protons in an atom c) number of protons and neutrons in an atom d) number of valence electrons in an atom

d) number of valence electrons in an atom

a sulfur atom has a larger atomic radius than an oxygen atom. which statement best explains why? a) sulfur contains more protons than oxygen does b)the large number of protons in an oxygen atom pulls its electrons closer to the nucleus than the sulfur atom c) sulfur contains more electrons than oxygen does d) the valence shell of sulfur is farther away from the nucleus than the valence shell in oxygen

d) the valence shell of sulfur is farther away from the nucleus than the valence shell in oxygen

name the ion and determine whether anion or cation K+1

potassium and cation

it is found that two naturally occurring isotopes of Sa, (56Sa 74.23% by mass) and (58Sa 25.77% by mass.) what atomic mass would be represented on the periodic table?

sa-56