From total _____________ elements, ______________ elements were discovered through laboratory processes.

Correct option is D

The correct answer is (D) 

There are 118 elements in the periodic table. These elements range from hydrogen (H), with atomic number 1, to oganesson (Og), with atomic number 118.

• The periodic table consists of seven periods (horizontal rows) and 18 groups (vertical columns).
• Elements with atomic numbers 93 to 118 are called transuranic elements and are mostly synthetic (man-made).  
  

Information Booster:

• The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties
• It was first developed by Dmitri Mendeleev in 1869. The modern periodic table is structured based on the periodic law, which states that the properties of elements are a periodic function of their atomic number.
• There are 7 periods (horizontal rows) in the periodic table.
• There are 18 groups (vertical columns)
• S-block: Groups 1 and 2 (and helium in Group 18) – Elements in this block have electrons in the s-orbital.
• P-block: Groups 13 to 18 – Elements in this block have electrons in the p-orbital.
• D-block: Transition elements (Groups 3 to 12) – Elements in this block have electrons in the d-orbital.
• F-block: Lanthanides and actinides – These elements are placed below the main body of the table.
• Metalsfound on the left and center of the table.
• Non- metal found on the right side of the table.
• Metalloids found along the zigzag line between metals and non-metals