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The ratio of the massA measure of the force required to impart unit acceleration to an object; mass is proportional to chemical amount, which represents the quantity of matter in an object. of a sample of a material to its volume.
The effect of increased nuclear charge and incomplete screening by filled f orbitals that results in a decrease in the size of atomsThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. appearing after the f blockThe lanthanides and actinides, elements in which the f atomic orbitals are being filled. in the periodic tableA chart showing the symbols of the elements arranged in order by atomic number and having chemically related elements appearing in columns..