How does the number of valence electrons change as one moves from top to bottom

What is the total number of electrons an atom of hydrogen can have in its valence shell?

How many valence electrons does lithium (II) have available for bonding?1234

How many electrons are in the outermost energy level of a neutral carbon atom?

Which part of an atom is actively exchanged or shared in a chemical bond?

How many valence electrons are in an atom of fluorine? two seven nine seventeen

An atom has 6 electrons in its outer shell. How many unpaired electrons does it have?

Name an element in the fourth period (row) of the periodic table with the following: a. two 3d electrons