Question 1

Which statement best describes an element according to the study materials?

Accepted Answer

An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction.

Question 2

Which of the following elements is represented by the symbol 'Na'?

Accepted Answer

Sodium

Question 3

What is the significance of an element's position in the periodic table?

Accepted Answer

It tells us much about its chemical properties.

Question 4

Which of the following is NOT a property of metals as described in the study materials?

Accepted Answer

They are gases at room temperature.

Question 5

Which element is a liquid at room temperature?

Accepted Answer

Mercury ($$\mathrm{Hg})$$

Question 6

Which group of elements is located along the zig-zag line between metals and nonmetals in the periodic table?

Accepted Answer

Metalloids

Question 7

Which of the following elements is a metalloid?

Accepted Answer

Silicon ($$\mathrm{Si})$$

Question 8

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus

Question 9

A neutral atom of carbon has an atomic number of 6. How many electrons does it have?

Accepted Answer

6

Question 10

Which statement about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 11

What is the mass number ($$A) of an $$atom with 17 protons and 20 neutrons?

Accepted Answer

$$A = 37$$

Question 12

Which of the following elements is a main group element?

Accepted Answer

Oxygen ($$\mathrm{O})$$

Question 13

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 14

Which of the following elements is most likely to exist as a diatomic molecule in nature?

Accepted Answer

Nitrogen ($$\mathrm{N}_2)$$

Question 15

Which element is considered a building block element in the human body?

Accepted Answer

Oxygen ($$\mathrm{O})$$

Question 16

What is the maximum number of electrons that can occupy the $$n=2$$ shell?

Accepted Answer

$$8$$

Question 17

Which orbital has a spherical shape?

Accepted Answer

$$s$$ orbital

Question 18

What is the electron configuration for neon ($$\mathrm{Ne}$$, $$Z=10$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 19

How many valence electrons does an atom of phosphorus ($$\mathrm{P}$$, group 5A) have?

Accepted Answer

$$5$$

Question 20

Which trend is observed for atomic size as you move down a group in the periodic table?

Accepted Answer

Atomic size increases

Atoms and the Periodic Table: Structure, Classification, and Properties

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