Question

question 5 (1 point)
(02.02 mc)
helium (he), oxygen (o), carbon (c) fluorine (f), and chlorine (cl) are all nonmetals. using the periodic table, which pair of nonmetals do you predict has the most similar properties, and why?
a oxygen and chlorine, because they are in both alkalis
b helium and carbon, because they are both noble gases
c oxygen and fluorine, because they are in the same period
d fluorine and chlorine, because they are both halogens

question 6 (1 point)
(02.02 mc)
nitrogen (n), oxygen (o), chlorine (cl), neon (ne), and argon (ar) are all gases at room temperature. using the periodic table, which pair of gases do you predict has the most similar properties, and why?
a nitrogen and oxygen, because they are both atmospheric gases
b oxygen and chlorine, because they are both halogens
c chlorine and neon, because they are both metalloids
d neon and argon, because they are both noble gases

question 7 (1 point)
(02.02 lc)
use the periodic table to match each of the following element symbols to its name, atomic mass, or atomic number.
column a column b

1. na a. 7 (atomic number)
2. ne b. sodium
3. n c. 20.180 u (atomic mass)

Explanation:

• Question 5: Elements in the same group of the periodic table have similar properties. Fluorine and chlorine are both in Group 17 (halogens), so they have similar chemical properties. Oxygen and chlorine are not in the same group and oxygen is not an alkali. Helium is a noble - gas and carbon is not. Oxygen and fluorine are in the same period but elements in the same group have more similar properties than those in the same period.
• Question 6: Noble gases have similar properties due to their full outer electron shells. Neon and argon are both noble gases in Group 18. Nitrogen and oxygen, while both atmospheric gases, are in different groups. Oxygen is not a halogen. Chlorine and neon are not metalloids.
• Question 7: From the periodic table, Na is the symbol for sodium (b), Ne is neon with an atomic mass of approximately 20.180 u (c), and N is nitrogen with an atomic number of 7 (a).

Answer:

• Question 5: d. Fluorine and chlorine, because they are both halogens
• Question 6: d. Neon and argon, because they are both noble gases
• Question 7:

1. b
2. c
3. a