Isotopes Isotope of an element is defined by the sum of the number of protons and neutrons in its nucleus. Density (g cm −3) Density is the mass of a substance that would fill 1 cm 3 at room temperature. Lithium, rubidium and caesium are much less abundant. The density increases from B to Tl. 2 Relative atomic mass The mass of an atom relative to that of carbon-12. This trend is shown in the figure below: The metals in this series are relatively light— lithium, sodium, and potassium are less dense than water (less than 1 g cm-3). The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). The chemical symbol for Hydrogen is H.. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. This isotope of carbon has 6 protons and 6 neutrons. Density of diamond form is 3500. 2 Helium: Density at 0° Celsius. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. This is approximately the sum of the number of protons and neutrons in the nucleus. Density, or volumic mass, is a measure of mass per unit of volume, - either kilograms per cubic meter or grams per cubic centimeter. 2 Fluorine: Density given for F at 0° Celsius. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Nitrogen: Density given for N at 0° Celsius. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). This page explores the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and caesium. The elements of group 13 have higher densities than group 2 elements. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Acid-Base Characteristics. Sodium and potassium are the most abundant Group 1 elements on the Earth, and can be found in rock salt deposits formed from salt water evaporation. Generally, the densities of all of the elements increase as you go down the group. This is because they have smaller sizes, and hence small volumes. Isotope: Atoms of the same element with the same atomic number, but different number of neutrons. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Density is mass divided by volume, so this causes the density to. Density. 2 Oxygen: Density given for O at 0° Celsius. Notes on the Density of particular elements: Hydrogen: Density given for H at 0° Celsius. You will find separate sections below covering the trends in atomic radius, first ionisation energy, electronegativity, melting and boiling points, and density. Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. The reason may be that as you go down a group, the atomic structure increases. The higher it is the more dense the substance is. Trends in Density. When it comes to the density of the metal, group one elements display a very low level of density of up to 1 gcm-3 which means that they can easily float on … The acidic character of oxides of group 13 elements decreases down the group and the basic character increases. Francium is radioactive and only has short lived isotopes formed from the decay of other elements. Where more than one isotope exists, the value given is the abundance weighted average. 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