Periodic Table Concepts and Elements

The video tutorial explains the purpose and structure of the periodic table, highlighting the contributions of Henry Moseley in reorganizing it based on atomic numbers. It describes the grouping of 118 elements into families and periods, detailing the characteristics of each group and the historical attempts to organize elements. The video concludes with a call to action for viewers to engage with the content.

What is the main purpose of the periodic table?

• To organize chemical elements

• To show physical properties of materials

• To list all known compounds

• To display chemical reactions

Who reorganized the periodic table based on atomic numbers?

• Antoine Lavoisier

• Dmitri Mendeleev

• Albert Einstein

• Henry Moseley

How many elements are there in the current periodic table?

• 92

• 118

• 26

• 150

What information is specified in each square of the periodic table?

• Element's name, symbol, and mass

• Element's name, atomic number, and mass

• Element's name, symbol, and atomic number

• Element's symbol, atomic number, and mass

How are the elements grouped in the vertical columns of the periodic table?

• By atomic mass

• By chemical reactivity

• By number of electrons in the outermost shell

• By number of protons

How many groups are there in the periodic table?

• 92

• 26

• 18

• 7

Which family includes the alkali metals?

• Family 18

• Family 17

• Family 2

• Family 1

What do the horizontal rows in the periodic table represent?

• Groups

• Periods

• Families

• Series

Who identified some of the first chemical elements?

• Dmitri Mendeleev

• Albert Einstein

• Henry Moseley

• Antoine Lavoisier