No, hydrogen does not have 3 valence electrons. In fact, hydrogen only has one valence electron.
Valence electrons are the outermost electrons in an atom that are involved in chemical reactions. They are the electrons that are most likely to be involved in bonding with other atoms to form molecules.
The number of valence electrons an atom has is determined by its position on the periodic table. The periodic table is organized so that elements in the same column, or group, have the same number of valence electrons.
Hydrogen is in group 1 of the periodic table, which means it has one valence electron. This is because it has one electron in its outermost energy level, also known as the first shell.
The number of valence electrons an atom has is important because it determines how easily it can form chemical bonds with other atoms. For example, since hydrogen only has one valence electron, it can only form one bond with another atom. This is why hydrogen usually forms bonds with other atoms to create molecules such as water (H2O) or methane (CH4).
It is possible that the confusion about hydrogen having 3 valence electrons may come from the fact that some other elements in the same row as hydrogen, such as boron and nitrogen, do have three valence electrons. However, this is not the case for hydrogen.
In summary, hydrogen only has one valence electron, not three. This is because it is in group 1 of the periodic table and has one electron in its outermost energy level. Understanding the number of valence electrons an atom has is important for understanding its chemical properties and how it interacts with other atoms to form molecules.