Chapter 2 HW

Rank the following kinds of electromagnetic radiation in order of decreasing wavelength. Rank the types of electromagnetic radiation by their wavelength from longest to shortest. To rank items as equivalent, overlap them.

(LEFT - longest wavelength TO RIGHT shortest wavelength): radio waves, microwaves, infrared light, red light, violet light, ultraviolet light, x rays, gamma rays.

Match each complete or abbreviated electron configuration with the element it corresponds to, assuming that each configuration is for a neutral atom. Drag the appropriate items to their appropriate bins.

*Carbon (C) = 1s22s22p2 *Phosphorus (P)= [Ne]3s23p3 *Tantalum (Ta) = 1s22s22p63s23p64s23d104p65s24d105p66s24f145d3 *Tellurium (Te)= [Kr]5s24d105p4 *Zinc (Zn)= [Ar]4s23d10 *Strontium (Sr)= 1s22s22p63s23p64s23d104p65s21s22s22p63s23p64s23d104p65s2

Atoms of 35/17 Cl contain ________ protons and ________ electrons.

17; 17

The maximum number of electrons in any orbital is ________.

2

Enter the maximum number of electrons in each type of sublevel (s, p, d, and f, respectively). Express your answer as integers separated by commas.

2,6,10,14 (NOTE: copy exactly like this above on the answer)

What is the maximum number of electrons that can be contained in the first, second, third, and fourth energy levels, respectively?

2,8,18,32 (NOTE: copy exactly like this above on the answer)

When writing a complete electron configuration, you write the filled sublevels in order first, and then if there is a partially filled sublevel, you write it last in the sequence. You can identify the last sublevel containing electrons by finding the element in the periodic table, and determining which block and sublevel the element corresponds to. Identify the last occupied sublevel, which can be completely or partially filled, for each of the following elements. Drag the appropriate items to their appropriate bins.

3s= Mg 3p= S 3d= Ni 4s= K 4f= Dy 5p=I 5d=Pt 5f= Cm

Sort the following elements by the number of protons in an atom of each. Drag the appropriate elements to their respective bins.

4 = Be 5 = B 9 = F 27 = Co 59 = Pr 112 = Cn

The atomic number of an atom containing 47 protons, 47 electrons, and 60 neutrons is

47 (NOTE: atomic number is the proton number.)

On the basis of Rutherford's experimental observations, which of the following statements predicts the structure of the atom? Check all that apply.

ANSWER: *In an atom, negatively charged electrons are dispersed in the space surrounding the positively charged nucleus of an atom. *In an atom, most of the mass and the positive charge are located in a small core within the atom called the nucleus.

Select the element(s) that will have one unpaired electron in the p orbital.

ANSWER: F, Ga (Note: Ga has one electron in the p orbital, and F has five electrons in the p orbital. Since there are three equivalent p orbitals, when there are five electrons, four will pair up in two of the orbitals and one will remain unpaired.)

How many dots are in the electron-dot symbol of Se?

ANSWER: 6 (NOTE: Selenium is a group 6A element with 6 valence electrons.)

Watch the animation depicting Rutherford's experiment and choose which of the following conclusions are correct. Check all that apply.

ANSWERS. All these are correct. *A positive charge is condensed in one location within the atom. *The majority of the space inside the atom is empty space. *The atom contains a positively charged nucleus. (NOTE: The positively charged αα particles where repelled by a positively charged mass within the atom.)

Using the periodic table and some characteristics of an atom, you can determine the composition of subatomic particles in a neutral atom. Complete the chart, indicating the element symbol and the number of protons, neutrons, and electrons in each atom. Drag the appropriate labels to their respective targets.

Ca = 20 protons, 42 mass number, 20 electrons, 22 neutrons Ge= 32 protons, 70 mass number, 32 electrons, 38 neutrons Br= 35 protons, 79 mass number, 35 electrons, 44 neutrons

The element with the electron configuration 1s2 2s2 2p6 3s2 3p5 is

Cl (chlorine)

Determine the number of neutrons in each of the following atoms given the mass number and atomic number. Match the numbers in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

FORMULA: (neutron = mass number - atomic number) 1. An atom of oxygen with a mass number of 15 and an atomic number of 8 has a total of 7 neutrons. (15-8= 7) 2. An atom of chlorine with a mass number of 35 and an atomic number of 17 has a total of 18 neutrons. (35-117=18) 3. An atom of potassium with a mass number of 39 and an atomic number of 19 has a total of 20 neutrons. 4. An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of 11 neutrons. 5. An atom of nitrogen with a mass number of 15 and an atomic number of 7 has a total of 8 neutrons.

What is the mass number of an ion with 104 electrons, 159 neutrons, and a +1 charge? Express your answer as an integer.

FORMULA: mass number= protons + neutron * charge 264= 104 + 159 + 1 charge ANSWER: 264

Locate aluminum in the periodic table and give its group number. Give its period number

Group number: 13 Period number: 3

Rank from largest to smallest atomic radius. To rank items as equivalent, overlap them

LARGEST TO SMALLEST: Na, Al, P, Cl, Ar

Rank the following atoms by number of valence electrons. Rank from most to fewest valence electrons. To rank items as equivalent, overlap them.

More valence electrons to fewer valence electrons: Xe, I, As, Ga, K

Write the complete electron configuration for gallium using the periodic table. Express your answer in complete form, in order of increasing orbital. For example, 1s22s21s22s2 would be entered as 1s^22s^2.

Type exactly like this on the answer: 1s^22s^22p^63s^23p^64s^23d^104p^1

Use the rules for determining electron configurations to write the electron configuration for Si. Express your answer in complete form in order of increasing orbital energy. For example, 1s22s21s22s2 should be entered as 1s^22s^2.

Write exactly like this: 1s^22s^22p^63s^23p^2

The smallest amount of an element that retains that element's characteristics is the:

atom

Which particle has a mass approximately equal to the mass of a proton?

neutron

Hydrogen exists as three isotopes. These isotopes differ by the number of ________ contained in the atom.

neutrons