Unit 1 Sec. B Summary HW 2

6/23/14

6) a. 12

b. 12

c. 12

d. 13

e. 12

f. 14

7) Each electron is about 1/2000^th the mass of the proton or neutron and the total mass of the electrons does not add significance to the mass of an atom.

8) Just by knowing the element’s mass number of 266 it is sufficient information to justify the claim of the discovery of a new element because the mass number gives you information of the number of protons, neutrons, and electrons. 

9) a. Another term for the row of the periodic table is periods.

b. Another term for the column of the periodic table is group or family.

10) Sodium (Na) and Potassium (K) are two elements in the alkali metal family.

#2 on pg. 57

a. Chlorine:      17 protons      18 electrons     Neutral? No      Charge: 1-

b. Cobalt:        27 protons      24 electrons     Neutral?  No      Charge: 3+   

c. Gold:           79 protons      76 electrons     Neutral?  No      Charge: 3+

d. Strontium:   38 protons      36 electrons     Neutral?  No      Charge: 2+

e. Argon:         18 protons      18 electrons     Neutral? Yes     Charge:  0