Chemistry Test 2- The Structure of the Atom 1

What is the charge on an electron? A. -1 B. 0 C. +1 D. +2

A. -1

A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion? A. -3 B. -2 C. 0 D. +3

A. -3

In which of these statements are protons, electrons, and neutrons correctly compared? A. Quarks are present in protons and neutrons but not in electrons. B. Quarks are present in protons, neutrons, and electrons. C. Quarks are present in neutrons and electrons but not in protons. D. Quarks are present in protons and electrons but not in neutrons.

A. Quarks are present in protons and neutrons but not in electrons.

A lithium atom has three protons, three neutrons, and three electrons. What is the overall charge on this atom? A. -3 B. 0 C. +1 D. +3

B. 0

The mass number of Fe2+ is 56. How many neutrons are there in a single Fe2+ atom? A. 28 B. 30 C. 56 D. 58

B. 30

The table below gives some characteristics of element Y. Characteristics of element Y Values Mass number 11 Number of neutrons in a single atom 6 Average atomic mass (grams/mole) 10.81 What is the identity of element Y? A. C B. B C. Na D. S

B. B

The diagram below is an artist's impression of a single atom of element Be. The neutrons are shown with stripes, the protons are gray, and the electrons are black. These particles are not drawn to scale. Which element below could be an isotope of this atom? A. sodium-10 B. beryllium-10 C. boron-9 D. carbon-9

B. Beryllium- 10

The diagram below shows some subatomic particles. mc007-1.jpg What is the particle that is labeled with a question mark (?) in the diagram? A. beta particle B. quark C. isotope D. alpha particle

B. Quark

The table below gives the numbers of protons, electrons, and neutrons in four atoms. Atom Number of protons Number of neutrons Number of electrons 1 9 8 9 2 9 9 8 3 9 9 10 4 9 10 9 Based on the table, which atom has a charge of -1? A. 1 B. 2 C. 3 D. 4

C. 3

Which two particles are found in the nucleus of an atom? A. neutrons and electrons B. protons and electrons C. protons and neutrons D. neutrons and atoms

C. Protons and neutrons

An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass? A. the neutron and the electron B. the proton and the electron C. the proton and the neutron D. the neutron and the atom

C. The proton and the neutron

The table below gives the atomic mass and relative abundance values for the three isotopes of element M. Relative abundance (%) Atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 What is the average atomic mass (in amu) of element M? A. 2.86 B. 5.36 C. 24.30 D. 24.98

D. 24.98

Which statement describes an electron? A. It has a positive charge and is located in the nucleus. B. It has a positive charge and is located in orbitals around the nucleus. C. It has a negative charge and is located in the nucleus. D. It has a negative charge and is located in orbitals around the nucleus.

D. It has a negative charge and is located in orbitals around the nucleus.

Which element has 16 protons in its nucleus? A. neon B. oxygen C. sodium D. sulfur

D. Sulfur

A scientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. What particles is the scientist studying? A. the He neutrons B. the He nucleus C. the He electrons D. the He quarks

D. The He quarks

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct? A. They both have seven protons in the nucleus. B. They both have the same mass number. C. They both have seven neutrons in the nucleus. D. They both have the same atomic number.

D. They both have the same atomic number.

Boron occurs naturally as two isotopes. What is the difference between these isotopes? A. They have different numbers of electrons and different charges. B. They have different numbers of neutrons and different charges. C. They have different numbers of protons and different mass numbers. D. They have different numbers of neutrons and different mass numbers.

D. They have different numbers of neutrons and different mass numbers.

A particle that orbits the nucleus in an atom is called a(n) _____________.

Electron