Let's solve each question step by step using the Periodic Table of Elements.
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1) What is the atomic symbol for silver?
- The atomic symbol for silver is
Ag.
-
Answer: Ag
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2) What is the atomic mass of mercury?
- The atomic mass of mercury (Hg) is approximately
200.59 u.
-
Answer: 200.59
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3) What period are the following elements in?
-
a. He: Helium is in
Period 1.
-
b. Ge: Germanium is in
Period 4.
-
c. Rb: Rubidium is in
Period 5.
-
d. I: Iodine is in
Period 5.
-
Answers:
- a. 1
- b. 4
- c. 5
- d. 5
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4) What group are the following elements in?
-
a. Sulfur: Sulfur is in
Group 16 (Oxygen family).
-
b. Ca: Calcium is in
Group 2 (Alkaline Earth Metals).
-
c. Iodine: Iodine is in
Group 17 (Halogen family).
-
d. Fe: Iron is in
Group 8 (Transition Metals).
-
Answers:
- a. 16
- b. 2
- c. 17
- d. 8
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5) Give an atom with the following characteristics.
-
a. Halogen: A halogen is any element in Group 17. Example:
Cl (Chlorine).
-
b. Metalloid: Metalloids are elements that have properties of both metals and nonmetals. Example:
Si (Silicon).
-
c. Alkali metal: Alkali metals are in Group 1. Example:
Li (Lithium).
-
d. Boron: Boron is already specified. Example:
B (Boron).
-
e. Lanthanide series: Elements in the lanthanide series are from Ce (Cerium) to Lu (Lutetium). Example:
Ce (Cerium).
-
f. Alkaline Earth metal: Alkaline Earth metals are in Group 2. Example:
Be (Beryllium).
-
g. Transition metal: Transition metals are in Groups 3–12. Example:
Fe (Iron).
-
h. Nobel gas: Noble gases are in Group 18. Example:
Ne (Neon).
-
Answers:
- a. Cl
- b. Si
- c. Li
- d. B
- e. Ce
- f. Be
- g. Fe
- h. Ne
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6) What is the mass number of carbon?
- The most common isotope of carbon has a mass number of
12.
-
Answer: 12
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7) Which atom has the lowest atomic mass?
- The atom with the lowest atomic mass is
Hydrogen (H), with an atomic mass of approximately
1.008 u.
-
Answer: H
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8) Name an element with 7 valence electrons in its 3rd energy level.
- An element with 7 valence electrons in its 3rd energy level must be in
Group 17 (the Halogen family) and have its outermost electrons in the third shell.
- The element that fits this description is
Chlorine (Cl).
-
Answer: Cl
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Final Answers:
1.
Ag
2.
200.59
3.
- a.
1
- b.
4
- c.
5
- d.
5
4.
- a.
16
- b.
2
- c.
17
- d.
8
5.
- a.
Cl
- b.
Si
- c.
Li
- d.
B
- e.
Ce
- f.
Be
- g.
Fe
- h.
Ne
6.
12
7.
H
8.
Cl
Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
1. \text{Ag} \\
2. \text{200.59} \\
3. \text{a. 1, b. 4, c. 5, d. 5} \\
4. \text{a. 16, b. 2, c. 17, d. 8} \\
5. \text{a. Cl, b. Si, c. Li, d. B, e. Ce, f. Be, g. Fe, h. Ne} \\
6. \text{12} \\
7. \text{H} \\
8. \text{Cl}
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of periodic table exercise worksheet.
