unit 2 chem quizzes

What are the 4 quantum numbers for the last electron to be placed in a selenium atom?

n= 4 l = 1 ml = -1 ms = -1/2

What energy level of an atom contains an electron with the lowest energy?

1

A 100 gram sample of naturally occurring boron contains 19.78 % of B-10 and 80.22 % of B-11. Which numerical setup can be used to determine the atomic mass of naturally occurring boron?

((19.78/100)(10)) + ((80.22/100)(11))

What is the maximum number of electrons that can occupy the 4d sublevel?

10

What is the maximum number of electrons that may be present in the third energy level of an atom?

18

What is the electron configuration of a fluoride ion (F-) in the ground state?

1s2 2s2 2p6

How many valence electrons does a uranium atom have?

2

What is the total number of completely filled energy levels in an atom of argon at ground state?

2

Magnesium has 3 isotopes. Based on the weighted average, which isotope is this mass closest to? 24Mg 78.99% 23.985042amu 25Mg 10.00% 24.985837 amu 26Mg 11.01% 25.982593 amu

24Mg

Calculate the percent abundance of each of the 2 naturally occuring isotopes of copper. Cu-63 has an atomic mass of 62.9296 amu. Cu-65 has an atomic mass of 64.9277 amu.

69.15% and 30.85%

What isotope is represented by the following information: Z = 39 A = 79

79^Y

What is the specific occurrence that causes light to be emitted by electrons?

Electrons transition from a higher to lower energy level.

What type of element do all of the elements on the periodic table want to look like?

Noble Gases

What information do you need to know to calculate an atomic mass from the periodic table?

The percentage abundances of each isotope Selected: The relative masses of each isotope. The number of naturally occurring isotopes of the element

What is the noble gas configuration for a lead atom?

[Xe]6s2 4f14 5d10 6p2

Identify the element whose last electron to be placed has the following quantum numbers:

a. Na

What noble gas does a barium atom want to look like?

cXe

What is the order of types of orbitals in decreasing energy?

f, d, p, s

The valence electrons in an atom of phosphorous at ground state are all found in:

the third energy level