Topic Details (Notes format)

Atomic Number

Subject: Chemistry

Book: General Chemistry

The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. It defines the element’s identity; for example, hydrogen has Z = 1, helium has Z = 2, and so on. Because atoms are electrically neutral (in their standard state), the atomic number also indicates the number of electrons surrounding the nucleus. Differences in atomic number lead to different chemical properties and placement on the periodic table.

Practice Questions

Which element is represented by the symbol 'Na'?

View Question

What is the chemical formula of table salt?

View Question

Which element has the highest electronegativity?

View Question

Which element is commonly used as a catalyst in hydrogenation reactions?

View Question

Which gas is most abundant in Earth's atmosphere?

View Question

What is the chemical formula for methanol?

View Question

What is the chemical formula for bleaching powder?

View Question

Which element is represented by the symbol 'Cl'?

View Question

What is the chemical formula for phosphoric acid?

View Question

Which element is essential for the formation of hemoglobin?

View Question