Periodic Table Quiz

What does the atomic number of an element represent?

• Number of protons in the nucleus of an atom

• Number of electrons in the outer shell of an atom

• Total number of neutrons in an atom

• Mass of the atom in atomic mass units

Answer explanation

The atomic number of an element represents the number of protons in the nucleus of an atom, making it the correct choice.

Which element has the atomic number 1?

• Hydrogen

• Oxygen

• Carbon

• Nitrogen

Answer explanation

The element with atomic number 1 is Hydrogen, making it the correct choice.

What is the atomic mass of carbon?

• 12

• 14

• 23

• 11

Answer explanation

Carbon is a group 14 element located in period two

How many periods are there in the periodic table?

• 5

• 8

• 7

• 10

Answer explanation

There are 7 periods in the periodic table. Each period represents a horizontal row in the table, and there are a total of 7 rows, hence 7 periods.

How many groups are there in the periodic table?

• 25

• 12

• 18

• 20

Answer explanation

There are 18 groups in the periodic table, so the correct answer is 18.

What is the general trend of atomic size as you move from left to right across a period?

• Atomic size fluctuates

• Atomic size increases

• Atomic size decreases

• Atomic size remains constant

Answer explanation

Atomic size decreases as you move from left to right across a period due to increasing nuclear charge pulling electrons closer to the nucleus.

Which group of elements is known for their high reactivity?

• Halogens

• Alkali metals

• Transition metals

• Noble gases

Answer explanation

Alkali metals have less than 4 electrons filling the outermost shell of its atom. This causes the atom to have a higher tendency to release the valence electrons, thus achieving stable octet electron arrangement.

What are the properties of transition metals?

• Fully filled d or f electron subshells

• Non-colored compounds

• No oxidation states

• Partially filled d or f electron subshells, multiple oxidation states, colored compounds, good catalysts, high melting and boiling points

Answer explanation

Transition metals have partially filled d or f electron subshells, multiple oxidation states, colored compounds, good catalysts, high melting and boiling points.

Which element is commonly used in stainless steel?

• Iron

• Nickel

• Aluminum

• Chromium

Answer explanation

Chromium is commonly used in stainless steel for its corrosion resistance and durability.

What is the significance of the lanthanides and actinides in the periodic table?

• They are located in the middle of the periodic table

• They are placed separately at the bottom of the periodic table to maintain its structure.

• They are used as placeholders for unknown elements

• They have no specific significance

Answer explanation

They are placed separately at the bottom of the periodic table to maintain its structure.