Chem
Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.
a. Write the atomic symbol for each of these atoms.
b. How are these isotopes alike?
c. How are they different?
d. Why is the atomic mass of argon listed on the periodic table not a whole number?
e. Which isotope is the most abundant in a sample of argon?
a. 36Ar18 , 38Ar18 , 40Ar18
b. They all have the same number of protons and electrons.
c. They have different numbers of neutrons, which gives them different mass numbers.
d. The atomic mass of Ar listed on the periodic table is the weighted average atomic mass of all the naturally occurring isotopes.
e. The isotope Ar-40 is most abundant because its mass is closest to the atomic mass of Ar on the periodic table.
Indicate the number of each in the following:
a. orbitals in the 3d sublevel
b. sublevels in the n = 1 energy level
c. orbitals in the 6s sublevel
d. orbitals in the n = 3 energy level
a. There are five orbitals in the 3d sublevel
b. There is one sublevel in the n = 1 energy level
c. There is one orbital in the 6s sublevel
d. There are nine orbitals in the n = 3 energy level
Two isotopes of gallium are naturally occurring, with 69Ga31 at 60.11% (68.93 amu) and 71Ga31 at 39.89% (70.92 amu). Calculate the atomic mass for gallium using the weighted average mass method
69.72 amu
Match statements 1 to 3 with a to d.
1. They have the same shape.
2. The maximum number of electrons is the same.
3. They are in the same energy level.
a. 1s and 2s orbitals
b. 3s and 3p sublevels
c. 3p and 4p sublevels
d. three 3p orbitals
a. 1 and 2
b. 3
c. 1 and 2
d. 1, 2, and 3
Write the complete electron configuration for each of the following:
a. boron
b. sodium
c. lithium
d. magnesium
a. 1s22s22p1
b. 1s22s22p63s1
c. 1s22s1
d. 1s22s22p63s2
Give the symbol of the element that meets the following conditions:
a. has three electrons in the n = 3 energy level
b. has two 2p electrons
c. completes the 3p sublevel
d. completes the 2s sublevel
a. Al
b. C
c. Ar
d. Be
Write the abbreviated electron configuration for each of the following:
a. carbon
b. zirconium
c. antimony
d. fluorine
a. [He]2s22p2
b. [Kr]5s24d2
c. [Kr]5s24d105p3
d. [He]2s22p5
Write the atomic symbol for the isotope with each of the following characteristics:
a. 15 protons and 16 neutrons
b. 35 protons and 45 neutrons
c. 50 electrons and 72 neutrons
d. a chlorine atom with 18 neutrons
e. a mercury atom with 122 neutrons
a. 31P15
b. 80Br35
c. 122Sn50
d. 35Cl17
e. 202Hg80
Describe the shape of each of the following orbitals:
a. 1s
b. 2p
c. 5s
a. spherical
b. two lobes
c. spherical