An anion always . has a positive charge has a negative charge contains a group of two or more atoms with a positive charge contains a metal and a nonmetal forms covalent bonds

has a negative charge

Explanation:

Ions may be defined as the elements that acquires positive or negative charge over them. Two main types of ions are cations and the anions that are formed by the gain or loss of the element.

Cations are formed when the electrons are lost and thus protons outweigh the electrons, thus generating a positive charge.

Example: ,

Anions are formed when the electrons are gained and thuselectrons outweigh the protons, thus generating a negative charge.

Example: ,

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.