Chemistry Quiz

The atomic number of silver-108 is 47. Its mass number is 108. How many protons and neutrons does silver-108 contain?

A.47 protons,61 neutrons

Isotope A contains 56 protons and 80 neutrons. Isotope B contains 55 protons and 81 neutrons. Isotope C contains 57 protons and 80 neutrons. Isotope D contains 56 protons and 74 neutrons. Which isotopes have the same mass number?

A.A and B

An atom of hydrogen-2 contains one proton, one neutron, and one electron. Which particle(s) identify the atom as hydrogen?

A.the proton

Which combination best represent the mass and charge of a neutron?

B.1 amu;neutral

Fluorine-19 has an atomic number of 9 and a mass number of 19. How many neutrons does an atom of fluorine-19 contain?

B.10

One atom of iron contains 26 protons, 30 neutrons, and 26 electrons. Which of the following would be possible for another atom of iron?

B.26 protons,28 neutrons, and 26 electrons

The three most common isotopes of tin have mass numbers of 118, 119, and 120. If atoms of the isotope with a mass number of 118 contain 68 neutrons, how many protons are contained in the atoms of all isotopes of tin?

B.50

The atomic mass and abundance of Cr-50 is 49.946 amu and 4.3%. The atomic mass and abundance of Cr-52 is 51.941 amu and 83.8%. The atomic mass and abundance of Cr-53 is 52.941 amu and 9.5%. The atomic mass and abundance of Cr-54 is 53.939 amu and 2.4%. Which is the average atomic mass of chromium?

B.52.00 amu

An atom of uranium, whose atomic number is 92, transforms in nature to an atom of thorium plus a nucleus of helium, whose atomic number is 2. What is the atomic number of thorium?

B.90

Which atom has the greatest mass?

B.an atom with 8 protons,8 neutrons, and 8 electrons

Which two atoms are isotopes of the same element?

B.atom A:47 protons and 60 neutrons;atom B:47 protons and 62 neutrons

An atom of carbon-14 contains six protons, eight neutrons, and six electrons. Which will an atom of carbon-12 contain?

B.six protons,six neutrons,and six electrons

Which combination best represents the mass and the charge of a proton?

C. 1 amu;positive

The atomic mass of silver is 107.87. Silver has two very abundant isotopes occurring in almost equal proportions, along with a number of very rare isotopes. Which are most likely to be the atomic masses of the two most abundant isotopes of silver?

C.106.91,108.90

Indium possesses two naturally occurring isotopes, In-113 and In-115. The abundance and atomic mass of these isotopes is: In-113, 4.29% and 112.904; In-115, 95.71% and 114.904. Which is the average atomic mass of indium?

C.114.818

The four natural isotopes of iron have atomic masses of 53.9, 55.9, 56.9, and 57.9. If these were the only isotopes of iron and they occurred in equal abundance, which would be closest to the atomic mass of iron?

C.56

The atomic number of lead is 82.Its mass number is 207.How many protons,neutrons,and electrons does this atom of lead contain?

C.82 protons,125 neutrons,and 82 electrons

The mass number of one form of plutonium is 244. Which combination of protons and neutrons is possible for this form of plutonium?

C.94 protons, 150 neutrons

In nature, thorium (atomic number, 90) transforms spontaneously into radium (atomic number, 88), which spontaneously transforms into radon (atomic number, 86). What must occur for each of these transformations to take place?

C.In each case, two protons must be lost

Cadmium has eight naturally occurring isotopes.What do the isotopes have in common?

C.mass number

The mass of a proton is closest to the mass of which particle?

C.neutron

An atom of an element loses one proton and one electron. Which statement describes the result of this event?

D. A neutral atom of a new element is formed

The atomic number of polonium is 84.The atomic number lead is 82.Which must occur for polonium to be transformed into lead?

D.An atom of polonium must lose two protons

Which must occur for the atom of an element to be transformed into an atom of an element whose atomic number is less by two?

D.The atom must lose two protons

Which describes the number of protons in the atom of a particular element?

D.atomic number

Which qualities describe the mass and charge of an electron?

D.mass 1/1836 that of a proton;negative charge