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