Periodic Table and Chemical Elements

Who did create the periodic table of elements?

• Dmitri Mendeleev

• Isaac Newton

• Gilbert Lewis

• None of All

Answer explanation

Dmitri Ivanovich Mendeleev was a Russian chemist known for formulating the periodic law and creating a version of the periodic table of elements.

Mendeleev put the elements on the periodic table in the order of how many _____________________________ it has.

• Valence Electron

• Neutron

• Density

• Atomic Mass

What is chemical symbol for table salt?

• KCl

• NaCl

• CaCl2

• FeSO4

Answer explanation

Common table salt, is called as Saline for the medical solutions. The name 'Halite' is a natural (raw) form of sodium chloride.

What is the lightest element in the periodic table?

• Lithium

• Gold

• Hydrogen

• Lead

Answer explanation

Yes, hydrogen is considered the lightest element on the periodic table, with the simplest atomic structure, consisting of only one proton and one electron in its most common form (protium). 

How many alkali metals are there in the periodic table?

• 5

• 6

• 7

• 8

Answer explanation

Red circled elements are alkali metals.

What is the heaviest element's chemical symbol?

• Lead (Pb)

• Aluminum (Al)

• Osmium (Os)

• Uranium (U)

Answer explanation

On the periodic table, Uranium is represented by the symbol "U" and has the atomic number 92, placing it in the actinide series at the bottom of the table; it is considered a radioactive element. 

Au is the symbol for what chemical element?

• Gold

• Silver

• Platinum

• Argon

Answer explanation

"Au" on the periodic table represents the element Gold. "Au" is the chemical symbol for gold, derived from the Latin word "aurum" which means "shining dawn". 

Tags

NGSS.MS-PS1-1

What element is commonly used in making semiconductors?

• Iron

• Copper

• Aluminum

• Silicon

Answer explanation

A "silicon semiconductor" is a material made primarily from silicon, which has the unique property of being able to conduct electricity partially, meaning it can act as both a conductor and an insulator depending on the situation

Tags

NGSS.MS-PS1-1