Honors Chemistry Test Ch 4
What is the mass number for an oxygen atom that has 10 neutrons in its nucleus?
18
Use the periodic table to determine the number of electrons in a neutral atom of lithium.
3
one-twelfth the mass of a carbon atom having six protons and six neutrons a. mass number b. atomic mass unit c. atomic number d. atomic mass e. isotope f. answer not given
b
How may protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain? a. 75 electrons, 50 protons, 50 neutrons b. 70 neutrons, 75 protons. 50 electrons c. 50 protons, 50 electrons, 75 neutrons d. 120 neutrons, 50 protons, 75 electrons
c
The mass number of an atom of iodine is 127, and the atomic number is 53. a. 74 b. 127 c. 53 d. 7
c
An isotope of oxygen, atomic number 8, could have a. 8 protons and 10 neutrons b. 10 protons and 10 electrons c. 10 protons and 8 electrons d. 6 protons and 8 neutrons
a
How many neutrons are present in an atom of silver which has a mass number or 108? a. 61 b. 14 c. 108 d. 47
a
The development of the concept that elements have isotopes helps explain why atomic a. masses are not whole numbers b. nuclei are neutral c. nuclei are charged d. masses differ from atomic numbers
a
The total number of protons and neutrons in the nucleus of an atom a. mass number b. atomic mass unit c. atomic number d. atomic mass e. isotope f. answer not given
a
Which model of the atom is thought to be true? a. electrons are distributed around the nucleus and occupy almost all the volume of the atom. b. the nucleus is made of protons, electrons, and neutrons c. the nucleus is made of electrons and protons d. Protons, electrons, and neutrons are evenly distributed throughout the volume of the atom
a
A nucleus having the following description: protons=16 and neutrons=15 would be in an atom of a. P b. S c. Ga d. H e. O
b
An atom of the element beryllium consists of 4 protons, 5 neutrons, and 4 electrons. The mass number of this atom is a. 13 b. 9 c. 5 d. 4
b
In an experiment by Rutherford, the deflection of alpha particles backwards when shot at gold foil indicated a. the alpha particle was very light and positively charged b. all the positive charge and most of the mass of the atom was concentrated in a small volume c. all matter was continuous and impenetrable
b
The number of electrons in the atoms whose atomic number is 3 and whose mass number is 7 is a. 7 b. 3 c. 10 d. 4 e. 5
b
Using the periodic table, determine the number of neutrons in Oxygen-16. a. 24 b. 8 c. 16 d. 4
b
Which discovery did JJ Thomson make that improved upon Dalton's atomic theory? a. Atoms contain a tiny, positively charge nucleus. b. Atoms contain tiny, negatively charged electrons. c. Atoms are always in motion d. Atoms that combine do so in simple whole number rations
b
Which of the following equals one atomic mass unit? a. the mass of one electron b. one-twelfth the mass of one carbon-12 atom c. the mass of one helium-4 atom d. the mass of one carbon-12 atom
b
Which of the following is true about subatomic particles? a. Protons are positively charged and the lightest subatomic particle b. Neutrons have no charge and are the lightest subatomic particle c. the mass of a neutron nearly equals the mass of a proton d. electrons are negatively charged and are the heaviest subatomic particle
c
Which of these statements is correct? a. none of these b. an electron is a negatively charged particle in the nucleus c. Protons are charged particles in the nucleus d. a proton is a negatively charged particle in the nucleus e. Neutrons and protons are charged particles in the nucleus
c
the number of protons in the nucleus of an element a. mass number b. atomic mass unit c. atomic number d. atomic mass e. isotope f. answer not given
c
Dalton's atomic theory included which idea? a. Atoms of different elements always combine in one-to-one ratios b. all atoms of all elements are the same size c. individual atoms can be seen with a microscope d. atoms of the same element are always identical
d
Since an atom is considered to be electrically neutral, the number of electrons is equal to the number of a. protons-neutrons b. protons+neutrons c. neutrons d. protons
d
The atoms of the isotopes of hydrogen a. have one proton but differ in the number of electrons b. differ in the number of protons c. have the same mass d. have one proton but differ in the number of neutrons
d
What does the number 84 in the name krypton-84 represent? a. the sum of the protons and electrons b. twice the number of protons c. the atomic number d. the mass number
d
What is the mass number of an isotope of hydrogen consisting of 1 proton, 1 electron, and 2 neutrons? a. 5 b. 1 c. 2 d. 3 e. 4
d
Which of the following is a characteristic of an atom? a. all atoms are alike b. all atoms have the same mass, which equals 1 a.m.u. c. an atom is the smallest particle of matter d. an atom is the smallest particle of an element with the properties of the element.
d
Who conducted experiments to determine the quantity of charge carried by an electron? a. Rutherford b. Dalton c. Thomson d. Millikan
d
the weighted average of the masses of the isotopes of an element a. mass number b. atomic mass unit c. atomic number d. atomic mass e. isotope f. answer not given
d
Atoms with the same number of protons, but different number of neutrons in the nucleus of an atom. a. mass number b. atomic mass unit c. atomic number d. atomic mass e. isotope f. answer not given
e
Which particle has a mass of approximately one atomic mass unit? a. Electron b. Alpha particle c. Carbon-12 nucleus d. Oxygen-16 nucleus e. Protons
e
