In other words, 68% of the norm group has a score within one standard deviation of the average (100). Also, 95% of the norm group has an IQ score within two standard deviations of the average. So, 95% of the norm group has a score between 70 (100 â 30) and 130 (100 + 30). This means scores of over 130 only occur in 2,5% of cases. For example, the Netherlands has 16 million inhabitants.
Is the molecule the basic unit for all elements? No, the atom is the basic unit for elements. An element consists of one type of atom; iron consists of iron atoms, sulfur consists of sulfur atoms, and so on. A Molecule is a â¦group of atoms of one or more types; carbon dioxide (CO2) is a molecule consisting of one carbon atom and two oxygen atoms, water (H2O) consists of two hydrogen atoms and one oxygen atom.
Atomic elements are those that exist in nature with single atoms as their basic units. For example, He, Al, Fe, Mg. Molecular elements do not normally exist in nature with single atoms as their basic units. Instead, these elements exist as molecules, two or more atoms of the element boned together.For example, O2, H2, N2, Cl2.Do not confuse Molecular ELEMENTS with Molecular COMPOUNDS. Molecular compounds are usually composed of two or more covalently bonded nonmetals.or example, H2O (Water) has a molecular mass of 18u approximately. It is obtained by multiplying the atomic mass of en element by the number of atoms present and then adding up the atomic mass of all the elements, i.e., (2x1) + (1x16) = 18u. We are multiplying 1 by 2 as there are 2 atoms of hydrogen in the molecule.