Question 1

Which of the following best describes the periodic trend for melting point among the main group elements from Group 1A to 4A as you move from left to right across a period?

Accepted Answer

Melting point generally increases.

Question 2

Given the periodic trend, which element would you expect to have the lowest boiling point among the following: $$\mathrm{Na}$$, $$\mathrm{Mg}$$, $$\mathrm{Al}$$, $$\mathrm{Si}$$?

Accepted Answer

$$\mathrm{Na}$$

Question 3

Which of the following statements about boiling point trends in the main group elements is correct?

Accepted Answer

Boiling point increases as you move down a group in Group 1A to 4A.

Question 4

Which element would be most easily vaporized under standard conditions?

Accepted Answer

$$\mathrm{K}$$

Question 5

A scientist is comparing the melting points of $$\mathrm{N}$$, $$\mathrm{P}$$, $$\mathrm{O}$$, and $$\mathrm{Bi}. $$Based on periodic trends, which element is expected to have the highest melting point?

Accepted Answer

$$\mathrm{Bi}$$

Question 6

Which of the following best explains why $$\mathrm{Si}$$ has a higher melting point than $$\mathrm{Al}$$?

Accepted Answer

$$\mathrm{Si} is a $$metalloid with a giant covalent structure, requiring more energy to break.

Question 7

Which of the following elements from Group 5A to 8A would you expect to have the lowest boiling point?

Accepted Answer

$$\mathrm{O}$$

Question 8

If you move from $$\mathrm{Li} to$$ $$\mathrm{C}$$ across Period 2, what general trend do you observe in melting point?

Accepted Answer

Melting point increases.

Question 9

Which of the following elements would you expect to have the highest boiling point: $$\mathrm{K}$$, $$\mathrm{Ca}$$, $$\mathrm{Ga}$$, $$\mathrm{Ge}$$?

Accepted Answer

$$\mathrm{Ge}$$

Question 10

A chemist is designing a high-temperature furnace and needs a main group element with a very high melting point. Which of the following would be the best choice?

Accepted Answer

$$\mathrm{C}$$

Question 11

Which of the following best describes the trend in boiling point for Group 5A to 8A elements as you move down a group?

Accepted Answer

Boiling point increases.

Question 12

Which of the following elements would be expected to have the lowest melting point: $$\mathrm{N}$$, $$\mathrm{P}$$, $$\mathrm{O}$$, $$\mathrm{Bi}$$?

Accepted Answer

$$\mathrm{O}$$

Question 13

Which of the following is the best explanation for the increase in boiling point as you move down Group 5A to 8A?

Accepted Answer

Increased molecular mass leads to stronger London dispersion forces.

Question 14

Which element would you expect to have the highest melting point: $$\mathrm{Si}$$, $$\mathrm{Al}$$, $$\mathrm{P}$$, $$\mathrm{S}$$?

Accepted Answer

$$\mathrm{Si}$$

Question 15

Which of the following elements is most likely to be a solid at room temperature due to its high melting point?

Accepted Answer

$$\mathrm{C}$$

Main Group Elements: Boiling & Melting Points

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