chapter 2 homework
There are two stable isotopes of copper found in nature, 63Cu and 65Cu. If the atomic weight of copper Cu is 63.546 amu, -does 65Cu contain more protons than 63Cu -is 63Cu more abundant that 65 CU - or all copper atoms have a mass of 63.546 amu
63Cu is more abundant than 65 Cu
the average atomic mass of Ga is 69.72 amu, Calculate the abundance of each isotope
69Ga, 71Ga= 60.3, 39.7%
The ion N^3- has how many protons and electrons?
7, 10
how many protons, neutrons and electrons are in an atom of 197Au
79 protons, 79 electrons, 118 electrons
write the chemical symbol for this element arsenic
As
write the chemical symbol for this element Bromine
Br
write the chemical symbol for this element chromium
Cr
write the chemical symbol for this element helium
He
How many neutrons are in an atom of each isotope? 24/12Mg, 25/12Mg, 26/12Mg
12, 13, 14 respectively
How many protons, neutrons and electrons are in an atom of phosphorus-31
15 protons, 15 electrons and 16 neutrons
Which of the following has the largest number of neutrons 148Eu 157Dy 149Nd 162Ho 159Gd
162Ho and 159Gd
I've the complete chemical symbol for the atom that contains 82 protons, 82 electrons, and 126 neutrons
208/82 Pb
magnesium has 3 isotopes with mass numbers 24, 25, and 26. Write the complete chemical symbol for each
24/12Mg, 25/12Mg, 26/12Mg
three isotopes of silicon occur in nature 28Si(92.23%), atomic mass of 27.9763 amu; 29Si (4.68%), atomic mass 28.97649 amu; and 30Si (3.09%), atomic mass 29.97377 amu. Calculate the atomic weight of silicon.
28.09 amu
specify the number of protons, neutrons and electron in the neutral atom bromine-80
35 protons,45 neutrons,35 electrons
Naturally occurring chlorine is 75.78%Cl (atomic mass 34.969 amu) and 24.22% 37Cl (Atomic mass 36.966 amu). Calculate the atomic weight of chlorine.
35.45amu
How many protons neutrons and electrons are in an atom of strontium-90
38 protons, 38 electrons, 52 neutrons
How many protons, neutrons and electrons are in an atom of 138Ba
56 protons, 56 electrons and 82 neutrons
which of these compounds are molecular P4O6, PbF2 CBr4 FeS
P4O6, CBr4
Name the ionic compound Ca(C2H3O2)2
calcium acetate
Name the ionic compound CaSO3
calcium sulfite
name the following oxide Cr2O3
chromium (III) oxide
Name the ionic compound Cr2(CO3)3
chromium(III) carbonate
Name the ionic compound Cu(OH)2
copper(II) hydroxide
name the following oxide MoO3
molybdenum(VI) oxide
name the following oxide NiO
nickel (II) oxide
how many protons and neutrons are in the nucleus of an isotope with mass of 70.925 amu?
p- 31, n-49
how many protons and neutron are in the nucleus of an isotope with mass of 68.926 amu?
p= 31, n= 38
How many protons and neutrons are in the nucleus of an isotope with mass of 70.925 amu
p= 31, n=40
Name the ionic compound K2CrO4
potassium chromate
Name the ionic compound NaClO
sodium hypochlorite
write the chemical symbol for this element phosphorus
P
Which one(s) of the following are a nonmetal magnesium, arsenic, bromine, zinc, chromium, helium, phosphorus
bromine, helium, phosphorus
Which element does X represent in the following expression 32 over 15 X
P
Name the ionic compound Li2O
Lithium oxide
Which one(s) of the following are a metal magnesium, arsenic, bromine, zinc, chromium, helium, phosphorus
Magnesium, zinc and chromium
write the chemical symbol for this element magnesium
Mg
assuming that the compounds are ionic what is the charge of each metallic element Ni of NiO- Cr of Cr2O3- Mn of MnO2- Mo of MoO3-
Ni of NiO- 2+ Cr of Cr2O3- 3+ Mn of MnO2- 4+ Mo of MoO3- 6+
what is the empirical formula of the compound formed between Os^s+ and O^2-
OsO4
A biochemist who is studying the properties of certain sulfur (S)-containing compounds in the body, wonders whether trace amounts of another nonmetallic element might have similar behavior. To which element should she turn her attention? As,O,P,Se,Cr
Se
what isotope has 14 protons and 14 neutrons?
Silicon- 28
write the chemical symbol for this element zinc
Zn
what are the groups in the periodic table
alkali metals, alkaline earth metals, transition metals, halogens, Chalcogens, noble gases
Name the ionic compound (NH4)2SO4
ammonium sulfate
Which one(s) of the following are a metalloid magnesium, arsenic, bromine, zinc, chromium, helium, phosphorus
arsenic
write the complete atomic symbol for each, p=31, n=40 with a mass of 70.925 amu showing the atomic number and mass number
gallium
Name the ionic compound Fe(OH)2
iron(II) hydroxide
Name the ionic compound FeCl3
iron(III) chloride
name the following oxide MnO2
manganese (IV) oxide
