Chapter 4 Post Lecture HW

Complete the 7th column (Number of electrons) for a neutral atom of each element: Express your answers as integers separated by commas.

1, 2, 3, 4: 30,24,19,16

Complete the 5th column (Number of protons) for a neutral atom of each element: Express your answers as integers separated by commas.

1, 2, 3, 5: 30,24,19,26

Complete the 1st column (Name of the element) for a neutral atom of each element: Spell out the full name of the elements separated by commas.

1, 2, 4, 5: zinc,chromium,sulfur,iron

Complete the 3rd column (Atomic number) for a neutral atom of each element: Express your answers as integers separated by commas.

1, 3, 4, 5: 30,19,16,26

Complete the 6th column (Number of neutrons) for a neutral atom of each element: Express your answers as integers separated by commas.

1, 5: 36,30

orbitals in the n=1 energy level. sublevels in the n = 4 energy level. orbitals in the 5d sublevel. orbitals in the 6p sublevel.

1,4,5,3

Enter the complete electron configuration for calcium.

1s^22s^22p^63s^23p^64s^2

Complete the 2nd column (Symbol) for a neutral atom of each element: Express your answers as chemical symbols separated by commas.

2, 3, 4, 5: Cr,K,S,Fe

Complete the 4th column (Mass number) for a neutral atom of each element: Express your answers as integers separated by commas.

2, 3, 4: 52,39,32

There are two naturally occurring isotopes of chlorine: 35/17Cl and 37/17Cl. Use the atomic mass of chlorine listed on the periodic table to identify the more abundant isotope. The atomic mass of chlorine listed on the periodic table is 35.45 a m u which is closest to _________ amu , thus the more abundant isotope of chlorine is _________.

35, 35/17 Cl

What electron sublevel starts to fill after completion of the 5s sublevel?

4p

What electron sublevel starts to fill after completion of the 4f sublevel?

5d

What electron sublevel starts to fill after completion of the 4d sublevel?

5p

What electron sublevel starts to fill after completion of the 5p sublevel?

6s

Calculate the atomic mass for bromine using the weighted average mass method. Two isotopes of bromine occur naturally, with 79/35Br at 50.69 % (78.92 amu ) and 81/35Br at 49.31 % (80.92 amu ).

79.91 amu The weighted average of these isotope masses is calculated as follows: 0.5069(78.92 amu)+0.4931(80.92 amu)

What are the number of protons, neutrons, and electrons in the following isotopes? A-2/1 H B-14/7 N C-40/19 K D-39/18 Ar express your answers as integers separated by commas.

A-1,1,1 B-7,7,7 C-19,21,19 D-18,21,18

For the following atoms, give the number of protons, neutrons, and electrons: A-40/20 Ca B-98/43 Tc C-199/79 Au D-222/86 Rn E-70/31 Ga Express your answers as integers separated by commas

A-20,20,20 B-43,55,43 C-79,120,79 D-86,136,86 E-39,31,39

[Xe]-6s2-4f14-5d10-6p5

At

a halogen in period 4 EXPRESS AS CHEMICAL SYMBOL

Br Groups in the periodic table refer to the "columns." The halogens are the elements located in group 7A (17), which is the second column from the right of the periodic table. Periods are the "rows" of the periodic table. Even though the halogens do not have an element in the first period, you can count down the column starting from period 2 to locate an element in a particular period.

group 4A (14), period 2 EXPRESS AS CHEMICAL SYMBOL

C Groups in the periodic table refer to the columns. Periods are the rows of the periodic table. Make sure you located the correct group and correct period for the element described in this problem. Note that, in groups 2A to 7A (17), there are no elements in period 1. Therefore, the first element in each of these groups, or columns, is considered in period 2 and the elements below them are in subsequent periods.

1s2-2s2-2p6-3s2-3p5

Cl

1s2-2s2-2p6-3s2-3p6-4s1-3d5

Cr

halogen with the highest ionization energy

F- Fluorine

Identify the group or period that contains Li and Cs.

Group 1A They're both in the first vertical column, meaning they'e in a group rather than a period since a period would be a horizontal row.

Identify the group or period that begins with the element B.

Group 3A Periods on the periodic table begin with elements in group 1A. Since B is not located in group 1A, B must be at the beginning of a group. Because B is located in the 3rd (not including transition elements) or 13th (including transition elements) column, it is the element that begins group 3A, one of the groups of representative elements on the periodic table.

Identify the group or period that contains the halogens

Group 7A Certain groups of the periodic table have special names. The halogens are elements located in group 7A. The newer system of assigning numbers to groups in the periodic table refers to this group as group 17.

Period 4 element with the smallest atomic radius

Kr

a noble gas in period 4 EXPRESS AS CHEMICAL SYMBOL

Kr Groups in the periodic table refer to the columns. Periods are the rows of the periodic table. Make sure you located the correct group and correct period for the element described in this problem. Note that, in groups 2A to 7A (17), there are no elements in period 1. Therefore, the first element in each of these groups, or columns, is considered in period 2 and the elements below them are in subsequent period

Of the elements: K, Ca, Br, Kr, which- is a noble gas? has the smallest atomic radius? has the lowest ionization energy? requires the most energy to remove an electron? is found in Group 2A, Period 4?

Kr, Kr, K, Kr, Ca

[Ne]3s2

Mg

an alkaline earth metal in period 3 EXPRESS AS CHEMICAL SYMBOL

Mg Groups in the periodic table refer to the "columns." The alkaline earth metals are the elements located in the second group, or column, from the left of the periodic table. Periods are the "rows" of the periodic table. Even though the alkaline earth metals do not have an element in the first period, you can count down the column starting from period 2 to locate an element in a particular period.

Identify the function of each of the following in the body: It is a component of bone and is required for metabolic reactions. - It contributes to growth of bones, teeth, and connective tissue and is needed for the immune system. - It is needed for proper thyroid function. - Its is the most prevalent positive ion in fluids outside cells, and it is needed for water balance, muscle contraction, and nerve impulses.

Mg- It is a component of bone and is required for metabolic reactions. Zn- It contributes to growth of bones, teeth, and connective tissue and is needed for the immune system. I- It is needed for proper thyroid function. Na- Its is the most prevalent positive ion in fluids outside cells, and it is needed for water balance, muscle contraction, and nerve impulses.

group 5A (15), period 2 EXPRESS AS CHEMICAL SYMBOL

N Groups in the periodic table refer to the columns. Periods are the rows of the periodic table. Make sure you located the correct group and correct period for the element described in this problem. Note that, in groups 2A to 7A (17), there are no elements in period 1. Therefore, the first element in each of these groups, or columns, is considered in period 2 and the elements below them are in subsequent periods.

1s2-2s2-2p6

Ne

[Ne]-3s2-3p3

P

Identify the group or period that contains Al, P, and Cl.

Period 3 The elements Al, P, and Cl are all located in the same row, or period. The first period contains only two elements: hydrogen and helium; period 2 is the only period that contains the elements Al, P, and Cl.

Group 2A (2) element with the smallest ionization energy

Ra

Classify each as an alkali metal, an alkaline earth metal, a transition element, or a halogen. Na, I, Mg, Zn

Zn is a transition element Z n is a transition element.. Na is an alkali metal N a is an alkali metal.. Mg is an alkaline earth metal M g is an alkaline earth metal.. I is a halogen

Enter the abbreviated electron configuration for calcium.

[Ar]4s^2

List the atomic number, mass number and number of protons-neutrons-electrons of the isotopes 28/14 Si, 29/14 Si, 30/14 Si.

atomic# - 14,14,14 mass# - 28,29,30 # of protons- 14,14,14 # of neutrons- 14,15,16 # of electrons- 14,14,14

mass number + atomic number

nothing useful

mass number - atomic number

number of neutrons

mass number

number of particles (protons plus neutrons) in the nucleus

atomic number

number of protons, and, if a neutral atom, the number of electrons

None of these isotopes has the atomic mass of 58.69 listed for nickel on the periodic table. Explain. The atomic mass of Ni is _________________________ of the five naturally occurring isotopes of nickel.

the weighted average of the masses