A) What element has 4 molecules?
(Phosphorus)
The elements that exist as diatomic molecules are hydrogen (H2), nitrogen (N2), fluorine (F2), oxygen (O2), iodine (I2), chlorine (Cl2) and bromine (Br2). A few other elements can exist as 3-atom molecules like ozone (O3) and 4-atom molecules like phosphorus (P4)
B)ements can be made of one atom, like He, or be elemental molecules, such as hydrogen (H2), oxygen (O2), chlorine (Cl2), ozone (O3), and sulfur (S8). Atoms are not drawn to scale. Some elements are monatomic, meaning they are made of a single (mon-) atom (-atomic) in their molecular form. Helium (He, see Fig
C) Here is a list of examples of compounds made up of exactly two elements.
H2O - water.
NaCl - sodium chloride or table salt.
KCl - potassium chloride.
HCl - hydrochloric acid.
N2O - nitrous oxide.
AgI - silver iodide.
AlN - aluminum nitride.
B4C - boron carbide.
I really hope this helps. Have a happy halloween!