CHEMISTRY 2024

Front

Who created the first version of the periodic table arranged by increasing atomic weights?

Back

Dimitri Mendeleev

Front

How many electrons does a calcium ion (Ca²⁺) have?

Back

18

Front

Which element is classified as a metalloid?

Back

Silicon (Si)

Front

What are the vertical columns on the periodic table called?

Back

Family

Front

Who grouped elements into gases, non-metals, metals, and earths?

Back

Antoine Lavoisier

Front

What is the atomic number of Calcium (Ca)?

Back

20

Front

What is the significance of the periodic law?

Back

The properties of elements are periodic functions of their atomic numbers.

Front

What are the main categories of elements in the periodic table?

Back

Metals, Nonmetals, Metalloids, Noble gases.

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, while an ion has a charge due to loss or gain of electrons.

Front

What is the electron configuration of Calcium (Ca)?

Back

1s² 2s² 2p⁶ 3s².