Density, or volumic mass, is a measure of mass per unit of volume, - either kilograms per cubic meter or grams per cubic centimeter. Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. Density is mass divided by volume, so this causes the density to. You will find separate sections below covering the trends in atomic radius, first ionisation energy, electronegativity, melting and boiling points, and density. Francium is radioactive and only has short lived isotopes formed from the decay of other elements. So as you go down the group 7A and element in the halogen family would have the same volume, the atomic mass increases. 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. This isotope of carbon has 6 protons and 6 neutrons. The melting points of these elements are quite low, which is 180° Celsius in the case of Lithium, while it is 39° Celsius in the case of Rubidium. Density (g cm −3) Density is the mass of a substance that would fill 1 cm 3 at room temperature. Isotopes 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. 2 Helium: Density at 0° Celsius. The higher it is the more dense the substance is. Notes on the Density of particular elements: Hydrogen: Density given for H at 0° Celsius. 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. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The acidic character of oxides of group 13 elements decreases down the group and the basic character increases. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Where more than one isotope exists, the value given is the abundance weighted average. Isotope of an element is defined by the sum of the number of protons and neutrons in its nucleus. 2 Fluorine: Density given for F at 0° Celsius. 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). This page explores the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and caesium. Acid-Base Characteristics. Carbon: Value given for graphite form. 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. This is because they have smaller sizes, and hence small volumes. 2 The elements of group 13 have higher densities than group 2 elements. Thus, each proton and neutron has a mass of about 1 amu. 2 Oxygen: Density given for O at 0° Celsius. This is approximately the sum of the number of protons and neutrons in the nucleus. Density. Generally, the densities of all of the elements increase as you go down the group. Trends in Density. The reason may be that as you go down a group, the atomic structure increases. The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). 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 … Relative atomic mass The mass of an atom relative to that of carbon-12. Nitrogen: Density given for N at 0° Celsius. 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