Count the different chemical symbols in a compound's chemical formula to identify the number of elements. For instance, in the formula for sucrose (table sugar) C12H22O11 there are three elements -- C, H, and O. These represent carbon, hydrogen, and oxygen.
Different elements within the compound/ion.
Number of valence electrons
The atomic number of an element refers to the number of protons in the nucleus within the element. This is how the element is identified.
It is determined from known oxidation states of other elements.
Elements in the same family have the same number of valence electrons.
Milk of magnesia is a compound. There are three elements within the milk of magnesium. Magnesium, hydrogen, and oxygen, are the three elements within the milk of magnesia compound.
Elements are listed in the periodic table. Each element has its individual atomic number and symbol. The atomic number is based on the number of protons within the nucleus of the atom. As of 2006 the table contained 117 chemical elements. 94 found naturally on earth and the rest are synthetic elements that have been produced artificially in particle accelerators.
Different elements within the compound/ion.
Number of valence electrons
HCl is a compound, liquid at normal temps and pressures; called hydrochloric acid. The elements in the compound are hydrogen and chlorine.
The atomic number of an element refers to the number of protons in the nucleus within the element. This is how the element is identified.
It is determined from known oxidation states of other elements.
Elements within a group always have the same number of valence electrons.
It is determined from known oxidation states of other elements.
valence electrons
elements in a group have the same number of valence electrons
Elements in the same family have the same number of valence electrons.