$$q = m \times c \times \Delta T$$

Question 1

Which of the following statements best explains why metals are good conductors of electricity?

Accepted Answer

Metals have delocalized electrons that can move freely throughout the structure.

Question 2

Which element has the smallest atomic radius among the first twenty elements?

Accepted Answer

Helium ($$He)$$

Question 3

A sample contains two isotopes of neon: $$^{20}_{10}Ne$$ and $$^{22}_{10}Ne. $$What is the difference between these isotopes?

Accepted Answer

They have different numbers of neutrons.

Question 4

Which of the following best describes the trend in ionization energy as you move from left to right across a period in the periodic table?

Accepted Answer

Ionization energy increases due to stronger attraction between nucleus and valence electrons.

Question 5

Which of the following elements is most likely to form a cation?

Accepted Answer

Sodium ($$Na)$$

Question 6

A student is given a periodic table with color-coded groups. Which group contains elements that are all gases at room temperature?

Accepted Answer

Noble gases

Question 7

Which of the following best describes a metalloid?

Accepted Answer

An element that has properties intermediate between metals and nonmetals.

Question 8

Which of the following is the correct formula for density?

Accepted Answer

$$density = \frac{mass}{volume}$$

Question 9

If an atom has 11 protons, 12 neutrons, and 11 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 11, Mass number: 23

Question 10

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons determine the chemical properties of an element.

Question 11

Which of the following elements is a nonmetal and is found in Group 16 of the periodic table?

Accepted Answer

Sulfur ($$S)$$

Question 12

Which property increases as you move down a group in the periodic table?

Accepted Answer

Atomic size

Question 13

A metalloid is used in computer chips because it can act as a semiconductor. Which element is most likely being described?

Accepted Answer

Silicon ($$Si)$$

Question 14

Which of the following best describes the trend in metallic character as you move down a group?

Accepted Answer

Metallic character increases.

Question 15

Which of the following is the correct formula for specific heat?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 16

Which of the following elements is a transition metal?

Accepted Answer

Iron ($$Fe)$$

Question 17

A patient is exposed to high levels of radiation. Which property of electromagnetic radiation is most relevant to the biological effect?

Accepted Answer

Wavelength: shorter wavelengths have higher energy and greater biological effect.

Question 18

Which of the following is true about the atomic structure of hydrogen ($$^1_1H$$)?

Accepted Answer

It has one proton and no neutrons.

Question 19

Which of the following best explains why atomic size decreases across a period?

Accepted Answer

The nuclear charge increases, pulling electrons closer.

Question 20

Which of the following elements is most likely to have the highest ionization energy?

Accepted Answer

Helium ($$He)$$

Fundamental Concepts in GOB Chemistry: Elements, Atoms, and Periodic Trends

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