History of the Periodic Table

What is the basis for arranging elements in the periodic table?

• Number of electrons

• Atomic weight

• Number of neutrons

• Number of protons

Answer explanation

The periodic table arranges the elements in rows and columns based on their atomic number, which comes from the amount of tiny particles called protons in each atom of the element.

Who developed the first periodic table?

• Marie Curie

• Albert Einstein

• Isaac Newton

• Dimitri Mendeleev

Answer explanation

A Russian chemist named Dimitri Mendeleev developed the first periodic table in 1869.

What is the purpose of the periodic table?

• To group elements with similar atomic weights

• To help chemists think about the elements and their properties

• To arrange elements in alphabetical order

• To determine the number of neutrons in each element

Answer explanation

The periodic table helps chemists think about the elements and their properties by arranging the elements in rows and columns based on their atomic number and grouping elements with similar chemical properties.

What was the basis for the periodic table developed by Dimitri Mendeleev?

• Atomic number

• Number of protons

• Number of electrons

• Atomic weight

Answer explanation

Mendeleev developed the first periodic table based on the relationship between the atomic weights and other properties of the elements.

What is the relationship between the atomic number and the arrangement of elements in the periodic table?

• Elements are arranged in order of decreasing atomic number from top to bottom in each column.

• Elements are arranged in order of increasing atomic number from left to right in each row.

• Elements are arranged in order of increasing atomic number from top to bottom in each column.

• Elements are arranged in order of decreasing atomic number from left to right in each row.

Answer explanation

The atomic number determines the position of an element in the periodic table. Elements are arranged in order of increasing atomic number from left to right in each row.

What is the purpose of grouping elements in the same column of the periodic table?

• To indicate elements that have similar atomic weights.

• To indicate elements that have similar chemical properties.

• To indicate elements that have similar atomic numbers.

• To indicate elements that have similar number of electrons.

Answer explanation

Elements in the same column of the periodic table have similar chemical properties. The columns form groups of elements that have similar chemical properties.