CHM Ch. 4 Atoms and Elements

(4.2) Identify the element described by each of the following groups and periods: 1. Group 7A (17), Period 4 A. Br B. Cl C. Mn 2. Group 2A (2), Period 3 A. beryllium B. boron C. magnesium 3. Group 5A (15), Period 2 A. phosphorus B. arsenic C. nitrogen

1. A 2. C 3. C

(4.5) 1. Which of the pairs below are isotopes of the same element? 2. In which of the pairs below do both atoms have eight neutrons? A. 15,8 X and 15, 7 X B. 12, 6 X and 14, 6 X C. 15,7 X and 16, 8 X

1. B 2. C

(4.7) Write the electron arrangement for the following elements: O?

1s22s22p4

(4.7) Write the electron arrangement for the following elements: Mn?

1s22s22p63s23p64s23d5

(4.7) Write the electron arrangement for the following elements: P?

1s22s22p63s23sp3

(4.6) How many sublevels are in the n=3 energy level?

3

(4.5) Gallium is an element found in lasers used in compact disc players. In a sample of gallium, there is 60.10% of 69Ga (atomic mass 68.926) atoms 39.90% of 71Ga (atomic mass 70.925) atoms What is the atomic mass of gallium?

31 G 69.72

(4.5) Write the atomic symbols for atoms with the following subatomic particles: A. 8 protons 8 neutrons 8 electrons B. 17 protons 20 neutrons 17 electrons C. 47 protons 60 neutrons 47 electrons

A. 16, 8 C B. 37, 17 CI C. 107, 47 Ag

(4.5) Naturally occurring carbon consists of three isotopes: 12C, 13C, and 14C. State the number of protons, neutrons, and electrons in each of the three isotopes. Isotope - 12C, 13C, 14C A. protons B. neutrons C. electrons

A. 6, 6, 6 B. 6, 7, 8 C. 6, 6, 6

(4.4) Use the periodic table to fill in the atomic number, number of protons, and number of electrons for each of the following elements: Atomic number, Protons, Electrons A. N B. Zn C. S

A. 7, 7, 7 B. 30, 30, 30 C. 16, 16, 16

(4.4) An atom of lead (Pb) has a mass number of 207. A. How many protons are in the nucleus? B. How many neutrons are in the nucleus? C. How many electrons are in the atom?

A. 82 B. 125 C. 82

Using the periodic table, write the group number, the period, and the valence electron configuration for the following: A. calcium B. lead

A. Calcium is in Group 2A (2), Period 4. It has a valence electron configuration of 4s2. B. Lead is in Group 4A (14), Period 6. It has a valence electron configuration of 6s26p2.

(4.1) Write the correct chemical symbols for each of the following elements: A. iodine B. iron C. magnesium D. zinc E. nitrogen

A. I B. Fe C. Mg D. Zn E. N

(4.2) List all of the elements that match the description. A. metals in Group 4A (14) Sn, Pb, C, Si, Ge B. nonmetals in Group 5A (15) Bi, N, P, As, Sb C. metalloids in Group 4A (14) C, Si, Ge, Sn, Pb

A. Sn, Pb B. N, P C. Si, Ge

(4.3) Which of the following subatomic particles fits each of the descriptions below? protons, neutrons, or electrons A. found outside the nucleus B. have a positive charge C. have mass but no charge

A. electrons B. protrons C. neutrons

(4.2) Identify each of the following elements as a metal, a nonmetal, or a metalloid: A. sodium B. chlorine C. silicon D. iron E. carbon

A. metal B. nonmetal C. metalloid D. metal E. nonmetal

(4.1) Give the names of the elements with the following symbols: A. P B. Al C. Mn D. H E. K

A. phosphorus B. aluminum C. manganese D. hydrogen E. potassium

(4.6) Types of sublevels and how many orbitals are in each sublevel?

S = 1 P = 3 D = 5 F = 7

(4.6) Which of the following elements are likely to have electrons in the 3p sublevel? C Si O As

Si has electrons in the 3p sublevel. As has electrons in the 3p sublevel.

(4.5) Lithium consists of two naturally occurring isotopes, 6Li and 7Li. Use the periodic table to predict which isotope is the more prevalent one. (According to the periodic table, the atomic mass of lithium is 6.941 amu.)

Since the total atomic mass of 7Li is closer to 7, the mass number of 7Li, the more prevalent isotope is 7Li.

(4.7) Use the periodic table to give the symbol and name for the element with the electron configuration of 1s22s22p63s23p64s23d7.

cobalt