CHM 2045 EXAM 1 QUESTIONS
WITH THE LATEST AND
UPDATED SCORE.
(1) Which of the following statements about subatomic particles is
TRUE?
A) Protons have about the same mass as electrons.
B) Neutrons and electrons are found in the nucleus of an atom.
C) Protons and neutrons have opposite, but equal in magnitude,
charges.
D) A neutral atom contains the same number of protons and electrons.
E) Electrons make up most of the mass of an atom. -- Correct Answer
✔✔ D) A neutral atom contains the same number of protons and
electrons.
(2) Identify the description of an atom.
A) electrons in nucleus; protons and neutrons in orbitals
B) protons and neutrons in nucleus; electrons in orbitals
C) neutrons in nucleus; protons and electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) neutrons and electrons in nucleus; protons in orbitals -- Correct
Answer ✔✔ B) protons and neutrons in nucleus; electrons in orbitals
(1) The mass number is equal to...
A) the sum of the number of the neutrons and electrons.
B) the sum of the number of the electrons and protons.
C) the sum of the number of protons and neutrons.
, D) the sum of the number of protons, neutrons, and electrons. --
Correct Answer ✔✔ C) the sum of the number of protons and neutrons
(2) An iron-56 nucleus contains
A) 56 protons and 56 neutrons.
B) 26 protons and 30 neutrons.
C) 56 protons and 26 neutrons.
D) 30 protons and 26 neutrons.
E) 26 protons and 26 neutrons. -- Correct Answer ✔✔ B) 26 protons and
30 neutrons
Determine the number of protons, neutrons and electrons in the
following:
18X
40
A) p+ = 18 n° = 22 e- = 40
B) p+ = 22 n° = 18 e- = 18
C) p+ = 40 n° = 22 e- = 18
D) p+ = 18 n° = 22 e- = 18
E) p+ = 18 n° = 18 e- = 22 -- Correct Answer ✔✔ D) p+ = 18 n° = 22
e- = 18
What does "X" represent in the following symbol?
35X
80 -- Correct Answer ✔✔ A) bromine
(5) The atomic number indicates __________.
A) the total number of neutrons and protons in a nucleus
B) the number of neutrons in a nucleus
C) the number of protons or electrons in a neutral atom
D) the number of atoms in 1 g of an element
WITH THE LATEST AND
UPDATED SCORE.
(1) Which of the following statements about subatomic particles is
TRUE?
A) Protons have about the same mass as electrons.
B) Neutrons and electrons are found in the nucleus of an atom.
C) Protons and neutrons have opposite, but equal in magnitude,
charges.
D) A neutral atom contains the same number of protons and electrons.
E) Electrons make up most of the mass of an atom. -- Correct Answer
✔✔ D) A neutral atom contains the same number of protons and
electrons.
(2) Identify the description of an atom.
A) electrons in nucleus; protons and neutrons in orbitals
B) protons and neutrons in nucleus; electrons in orbitals
C) neutrons in nucleus; protons and electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) neutrons and electrons in nucleus; protons in orbitals -- Correct
Answer ✔✔ B) protons and neutrons in nucleus; electrons in orbitals
(1) The mass number is equal to...
A) the sum of the number of the neutrons and electrons.
B) the sum of the number of the electrons and protons.
C) the sum of the number of protons and neutrons.
, D) the sum of the number of protons, neutrons, and electrons. --
Correct Answer ✔✔ C) the sum of the number of protons and neutrons
(2) An iron-56 nucleus contains
A) 56 protons and 56 neutrons.
B) 26 protons and 30 neutrons.
C) 56 protons and 26 neutrons.
D) 30 protons and 26 neutrons.
E) 26 protons and 26 neutrons. -- Correct Answer ✔✔ B) 26 protons and
30 neutrons
Determine the number of protons, neutrons and electrons in the
following:
18X
40
A) p+ = 18 n° = 22 e- = 40
B) p+ = 22 n° = 18 e- = 18
C) p+ = 40 n° = 22 e- = 18
D) p+ = 18 n° = 22 e- = 18
E) p+ = 18 n° = 18 e- = 22 -- Correct Answer ✔✔ D) p+ = 18 n° = 22
e- = 18
What does "X" represent in the following symbol?
35X
80 -- Correct Answer ✔✔ A) bromine
(5) The atomic number indicates __________.
A) the total number of neutrons and protons in a nucleus
B) the number of neutrons in a nucleus
C) the number of protons or electrons in a neutral atom
D) the number of atoms in 1 g of an element
