which element in group 1 has the highest density

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