One hundred million (100,000,000) hydrogen atoms put side-by-side equals about a centimeter. Chemical properties include the specific ways that atoms and molecules react and the energy that they release or use in these reactions. The number of electrons and protons in an atom determines its chemical properties. This force got its name because it is strong enough to overcome the force of the positively charged protons repelling each other. The strong force holds neutrons and protons together in the nucleus. The attraction between negatively charged electrons and positively charged protons in an atom give the atom its structure. Electrostatic forces also hold electrons and protons together in the atom. 2.11).Д®lectrostatic forces hold atoms together in molecules-like the two hydrogen atoms held together in H2 gas. Electrons exist in regions called shells outside of the atomвЂ™s nucleus (Fig. Protons and neutrons occupy the nucleus, or center, of the atom. neutron (n 0), which has no charge, it is neutral (0).electron (e вЂ“), which is negatively (вЂ“) charged and.proton (p +), which is positively (+) charged.The particles that make up an atom are called subatomic particles ( sub- means вЂњsmaller sizeвЂќ). 2.10).Дetermine how charged matter interacts. Common examples of static electricity are when someone gets a shock when reaching for a doorknob or when a childвЂ™s hair is raised when going down a plastic slide (Fig. The electrostatic forces that hold atoms together in molecules are the same type of forces that cause static electricity. 2.9).Д®lectrostatic forces hold atoms in molecules. Methane (CH 4), a common greenhouse gas, has five atoms, one of carbon (C) and four of hydrogen (H, see Fig. For example, water (H 2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom. Molecules of compounds have atoms of two or more different elements. All elemental molecules are made of atoms of a single element. Another form of oxygen, ozone (O 3), has three atoms, and sulfur (S 8) has eight atoms. Hydrogen (H 2), oxygen (O 2), and chlorine (Cl 2) molecules, for example, each contains two atoms. Other elements contain two or more atoms in their molecular form (Fig. 2.8) is an example of a monatomic element. Some elements are monatomic, meaning they are made of a single ( mon-) atom ( -atomic) in their molecular form. A hundred million (100,000,000) hydrogen atoms put side-by-side is only as long as one centimeter! The simplest structural unit of an element is an atom. The properties of elements and compounds are determined by their structures.

Oxygen atom known hide out locations