Question

Literacy 1. How many periods are there in the periodic table? 2. What is the difference between periods and groups in the periodic table? how many groups are there in the periodic table? what are the group and periodic numbers of HG Mercury? what elements are located in Group 3 of the periodic table? What elements are found in the 2nd period of Mendeleev's periodic table?​

Answer 1

Ответ:

1. There are seven periods in the periodic table.

2. Periods are the horizontal rows in the periodic table while groups are the vertical columns. There are 18 groups in the periodic table. The group and periodic number of HG Mercury is Group 12 and Period 6. The elements located in Group 3 of the periodic table are Boron (B), Aluminum (Al), Gallium (Ga), Indium (In), and Thallium (Tl). The elements found in the 2nd period of Mendeleev's periodic table are Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), and Neon (Ne).