Question

1. at room temperature, most of the elements in the periodic table are

a. solids.
b. gases.
c. nonmetals.
d. metalloids.

1. which of these describes bromine’s (br) (atomic number 35) location on the periodic table?

a. group 7a, period 4
b. group 4, period 7a
c. group 3a, period 2
d. group 2, period 3a

1. what is the correct ordering of the groups from left to right in the periodic table?

a. alkaline earth metals, alkali metals, halogens, noble gases
b. alkali metals, noble gases, alkaline earth metals, halogens
c. alkali metals, alkaline earth metals, halogens, noble gases
d. noble gases, alkali metals, alkaline earth metals, halogens

1. based on their locations on the periodic table, which pair of elements would you expect to have the most similar properties?

a. carbon, c, and silicon, si
b. copper, cu, and zinc, zn
c. nitrogen, n, and oxygen, o
d. hydrogen, h, and helium, he

1. based on their locations on the periodic table, which of these elements would you expect to have the greatest reactivity?

a. neon, ne
b. cesium, cs
c. boron, b
d. gold, au

1. what is the correct way to represent an aqueous solution of copper (ii) nitrate?

a. cu (s)
b. cu (aq)
c. cu(no₃)₂ (s)
d. cu(no₃)₂ (aq)

Explanation:

• Question 5: At room - temperature, most elements in the periodic table are solids. There are only 11 gases and a few liquids at room - temperature.
• Question 6: Bromine (Br) with atomic number 35 is in Group 7A (halogens) and Period 4.
• Question 7: The correct order of groups from left to right is alkali metals (Group 1), alkaline earth metals (Group 2), halogens (Group 17), noble gases (Group 18).
• Question 8: Elements in the same group have similar properties. Carbon (C) and silicon (Si) are both in Group 14.
• Question 9: Cesium (Cs) is an alkali metal and is highly reactive. Noble gases like neon (Ne) are inert, boron (B) is a metalloid and gold (Au) is a relatively non - reactive metal.
• Question 10: An aqueous solution of copper (II) nitrate is represented as Cu(NO₃)₂ (aq), where (aq) indicates an aqueous solution.

Answer:

1. A. solids
2. A. Group 7A, Period 4
3. C. alkali metals, alkaline earth metals, halogens, noble gases
4. A. carbon, C, and silicon, Si
5. B. cesium, Cs
6. D. Cu(NO₃)₂ (aq)