Question 1

How many elements are in the periodic table?

Accepted Answer

As of 2024, there are 118 confirmed elements. Elements 1–94 occur naturally; elements 95–118 are synthetic and produced in nuclear reactors or particle accelerators.

Question 2

What are the groups in the periodic table?

Accepted Answer

Elements are arranged in 18 vertical columns (groups) and 7 horizontal rows (periods). Group 1 = alkali metals (except hydrogen), Group 2 = alkaline earth metals, Groups 3–12 = transition metals, and Groups 13–18 contain the post-transition metals, metalloids, nonmetals, halogens, and noble gases.

Question 3

What are lanthanides and actinides?

Accepted Answer

Lanthanides (elements 57–71) and actinides (89–103) are the two rows placed separately below the main table to keep the table compact. They are also called the f-block elements because their valence electrons fill f orbitals.

Question 4

What does electronegativity mean?

Accepted Answer

Electronegativity (Pauling scale) measures how strongly an atom attracts electrons in a chemical bond. Fluorine (3.98) is the most electronegative element. Metals generally have low electronegativity; nonmetals have high values.

Question 5

Which element has the highest melting point?

Accepted Answer

Tungsten (W, element 74) has the highest melting point of all elements at 3,695 K (3,422 °C / 6,191 °F), which is why it is used in light bulb filaments.

Interactive Periodic Table of Elements

Frequently Asked Questions

Recommended Reading

Interactive Periodic Table of Elements

Frequently Asked Questions

Recommended Reading