CHEM 280: Lecture Quiz 2
Study online at https://quizlet.com/_crybq0
1. Chlorine has two stable isotopes, Cl-35 and Cl-37. 75.95%
If their exact masses are 34.9689 amu and 36.9695
amu, respectively, what is the natural abundance of
Cl-35? (The atomic mass of chlorine is 35.45 amu.)
2. What is the charge on an ion that has an atomic Charge on an Ion = # of proton
number of 24 and contains 22e-? - # of Electron
24-22= +2
3. The number of protons in the nucleus of an atom: all of the above
identifies the atom as a partic-
ular element.
is called the atomic number.
is the same for all isotopes of
an element.
is given the symbol "Z."
4. Which of the following statements about the nature All of the above statements are
of electrical charge is FALSE? true.
5. What is the atomic symbol for silver? Ag
6. What is the correct formula for a potassium ion with K+
18 electrons?
19 electrons, loses 1 electron,
becomes positive
7.
1/8
, CHEM 280: Lecture Quiz 2
Study online at https://quizlet.com/_crybq0
What is the mass number of the hydrogen isotope 3
that contains 2 neutrons?
Mass number of Isotope = # of
protons + # of neutrons
1+2=3
8. An isotope represented as S-34: contains exactly 18 neutrons.
S-34 (mass number = atomic
number - neutrons)
34=16-neutrons / neu-
trons=18
9. What is the charge on the cesium ion? 1+
Cesium=Cs
10. Which of the following is NOT a correct name, sym- manganese, Mn
bol combination? silicon, Si
magnesium, Mg
beryllium, Be
iron, I (X) Fe
11. How many protons and neutrons are in Cl-37? 17 protons, 20 neutrons
Cl-37 (mass = # of protons + #
of neutrons)
37=17-neutrons / neutrons: 20
12. When an atom gains an electron, the resulting par- an anion
ticle is called:
13. What is the charge on a calcium atom that contains
18e-?
2/8
Study online at https://quizlet.com/_crybq0
1. Chlorine has two stable isotopes, Cl-35 and Cl-37. 75.95%
If their exact masses are 34.9689 amu and 36.9695
amu, respectively, what is the natural abundance of
Cl-35? (The atomic mass of chlorine is 35.45 amu.)
2. What is the charge on an ion that has an atomic Charge on an Ion = # of proton
number of 24 and contains 22e-? - # of Electron
24-22= +2
3. The number of protons in the nucleus of an atom: all of the above
identifies the atom as a partic-
ular element.
is called the atomic number.
is the same for all isotopes of
an element.
is given the symbol "Z."
4. Which of the following statements about the nature All of the above statements are
of electrical charge is FALSE? true.
5. What is the atomic symbol for silver? Ag
6. What is the correct formula for a potassium ion with K+
18 electrons?
19 electrons, loses 1 electron,
becomes positive
7.
1/8
, CHEM 280: Lecture Quiz 2
Study online at https://quizlet.com/_crybq0
What is the mass number of the hydrogen isotope 3
that contains 2 neutrons?
Mass number of Isotope = # of
protons + # of neutrons
1+2=3
8. An isotope represented as S-34: contains exactly 18 neutrons.
S-34 (mass number = atomic
number - neutrons)
34=16-neutrons / neu-
trons=18
9. What is the charge on the cesium ion? 1+
Cesium=Cs
10. Which of the following is NOT a correct name, sym- manganese, Mn
bol combination? silicon, Si
magnesium, Mg
beryllium, Be
iron, I (X) Fe
11. How many protons and neutrons are in Cl-37? 17 protons, 20 neutrons
Cl-37 (mass = # of protons + #
of neutrons)
37=17-neutrons / neutrons: 20
12. When an atom gains an electron, the resulting par- an anion
ticle is called:
13. What is the charge on a calcium atom that contains
18e-?
2/8
