Question

1. Who was the first person to create a periodic table? When?

2. What is the modern periodic table?

3. Compare and contrast the periods and groups of the modern periodic table.

4. In the modern periodic table (found in the back of your agenda), find the element named lead (Pb). How many protons do atoms of lead have? To which class of elements does lead belong?

5. Most of the elements on the periodic table belong to what class of elements.

6. Which groups of the modern periodic table contain elements that are classified as metalloids?

Answer 1

Mendeleev discovered the periodic table (or Periodic System, as he called it) while attempting to the elements in February of 1869. also I made a enderBender of our pfp!

Answer 2

Mendeleev discovered the periodic table (or Periodic System, as he called it) while attempting to organise the elements in February of 1869.

Step-by-step explanation: