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2. Examine each of the following statements. What is incorrect about each statement? How can each statement be changed to make it a correct statement? (a) A hydrogen atom has one energy level. (b) A lithium atom has three electrons, two in the 1s sublevel and one in the 2p sublevel. (c) The angular momentum quantum number, l, of an electron in a p sublevel has a value of 2. (d) Three electrons in a p sublevel will occupy separate orbital, so one will be positive (+1), one will be neutral (0), and one will be negative (-1). (e) Two electrons in the same orbital must have same spin. 3. Two isotopes of hydrogen occur naturally (1H, > 99 %, and 2H, < 1 %) and two of chlorines occur naturally (35Cl, 76 %, and 37Cl, 24 %). (a) How many different masses of the HCl molecules can be formed from these isotopes? (b) What is the approximate mass of the molecules, expressed in atomic mass units? (Use atomic weights rounded to the nearest whole number.) (c) List these HCl molecules in order of decreasing relative abundance. 4. An atom in its ground state contains 18 electrons. How many of these electrons are in orbital with l = 0 values?

          2. Examine each of the following statements. What is incorrect about each statement?
How can each statement be changed to make it a correct statement?
(a) A hydrogen atom has one energy level.
(b) A lithium atom has three electrons, two in the 1s sublevel and one in the 2p
sublevel.
(c) The angular momentum quantum number, l, of an electron in a p sublevel has a
value of 2.
(d) Three electrons in a p sublevel will occupy separate orbital, so one will be positive
(+1), one will be neutral (0), and one will be negative (-1).
(e) Two electrons in the same orbital must have same spin.
3. Two isotopes of hydrogen occur naturally (1H, > 99 %, and 2H, < 1 %) and two of
chlorines occur naturally (35Cl, 76 %, and 37Cl, 24 %). (a) How many different masses
of the HCl molecules can be formed from these isotopes? (b) What is the approximate
mass of the molecules, expressed in atomic mass units? (Use atomic weights rounded
to the nearest whole number.) (c) List these HCl molecules in order of decreasing
relative abundance.
4. An atom in its ground state contains 18 electrons. How many of these electrons are in
orbital with l = 0 values?

2. Examine each of the following statements. What is incorrect about each statement?
How can each statement be changed to make it a correct statement?
(a) A hydrogen atom has one energy level.
(b) A lithium atom has three electrons, two in the 1s sublevel and one in the 2p
sublevel.
(c) The angular momentum quantum number, l, of an electron in a p sublevel has a
value of 2.
(d) Three electrons in a p sublevel will occupy separate orbital, so one will be positive
(+1), one will be neutral (0), and one will be negative (-1).
(e) Two electrons in the same orbital must have same spin.
3. Two isotopes of hydrogen occur naturally (1H, > 99 %, and 2H, < 1 %) and two of
chlorines occur naturally (35Cl, 76 %, and 37Cl, 24 %). (a) How many different masses
of the HCl molecules can be formed from these isotopes? (b) What is the approximate
mass of the molecules, expressed in atomic mass units? (Use atomic weights rounded
to the nearest whole number.) (c) List these HCl molecules in order of decreasing
relative abundance.
4. An atom in its ground state contains 18 electrons. How many of these electrons are in
orbital with l = 0 values?

Added by Athenkosi F.

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