what are the densities of the alkali metals?
153801
Look them up from the source.
93653
Depends on temperature. Iridium is most dense at room temperature (22.65 grams per cubic cm) but not at its melting point. See Source
856024
Alkali earths are the elements of group 2.\nAlkali metals are the elements of group 1.\n\nHere are the properties of group 2\nhttp://en.wikipedia.org/wiki/Alkaline_earth_metal\n\nHere are the properties of group 1\nhttp://en.wikipedia.org/wiki/Alkali_metal\n\nYou can compare them.\n\nHere is the water reaction with elements of group 1 (example K)\n\n2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)\n\nHere is the water reaction with elements of group 2 (example Mg)\n\nMg + 2H2O → Mg(OH)2 + H2\n\nAs you go to the extremes of the table and down the table the reactivity is higher because the electronegativiy is lower so they have a greater tendency to lose the electron and react.
778176
Use the periodic table of the elements.  The "weights" are in grams per mol.  Just use algebra and solve for the number of mols.  Then you know how many atoms there are by the number of mols which is a definite number.
374138
Need to be more specific in your question.  There are many different types of salts, each with their own densities.
1133778
http://online.unitconverterpro.com/metric-conversion-tables/convert-alpha/density.html
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Confusion between base and alkali\nThe terms "base" and "alkali" are often used interchangeably, since most common bases are alkalis. It is common to speak of "measuring the alkalinity of soil" when what is actually meant is the measurement of the pH (base property). Similarly, bases which are not alkalis, such as ammonia, are sometimes erroneously referred to as alkaline.\n\nNote that not all or even most salts formed by alkali metals are alkaline; this designation applies only to those salts which are basic.\n\nWhile most electropositive metal oxides are basic, only the soluble alkali metal and alkali earth metal oxides can be correctly called alkalis.\n\nThis definition of an alkali as a basic salt of an alkali metal or alkali earth metal does appear to be the most common, based on dictionary definitions
966827
Mercury consists of approximately 70% metallic and 30% silicate material. The density of the planet is the second-highest in the solar system at 5430 kg/m³, only slightly less than Earth's density.\n\nA high percentage of iron.
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Obviously, being Alkili metals, these elements would reaction vigorously with water to produce Hydrogen gas (which would soon ignite) and the metal Hydroxide.\nJudging from the trend which can be seen by comparing reaction of Lithium, Sodium, and Potassium with water, as you move down the group, the reaction become more violent.\n\nOne could calculate the exact energy released by using the enthalpies of formation and solution of the compounds.\n\nAlso, as you move down the group, the elements become rarer and rarer.\nFrancium is very instable (even the most stable isotope) and will only exist in a laboratory for a short time.
123586
Density = 13.5 g/cm^3\n13.5 g = about .0297 pounds\n\n4/.0297= about 134.52 cm^3, or 134.52 milliliters.
278991
AtoName of Element : Cesium \nSymbol of Element : Cs \nAtomic Number of Cesium : 55\nAtomic Mass: 132.90546 amu \nMelting Point: 28.5 °C - 301.65 °K \nBoiling Point: 678.4 °C - 951.55005 °K\nNumber of Protons/Electrons in Cesium : 55\nNumber of Neutrons in Cesium : 78\nCrystal Structure: Cubic \nDensity @ 293 K: 1.873 g/cm3 \nColor of Cesium : silvery-white
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mercury\n\nmercury is a liquid metal\nand its composed of potassium, sodium, oxygen, argon, helium, nitrogen, Carbon dioxide, water, and hydrogen
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density = Mass/Volume\nDensity of water=1kg/m^3 or (g/cm^3)\ntherefore density of soda here =1\nvolume 2 L= 2 m^3\nso\nMass of the soda =density of soda X Volume of soda= 1X 2= 2 Kg
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Osmium and Iridium are the two most dense elements in pure form. They are also very pretty metals, iridium particularly. Unlike osmium, iridium does not tarnish in air, and is in fact impervious to many forms of chemical attack, much like platinum. An alloy of 90% platinum and 10% iridium is widely used in both the jewelry and chemical industries, because it is strong, hard, beautiful, and impervious to almost all chemicals even at very high temperatures.\n\nWhich is the most dense element, osmium or iridium? That honor has changed hands a couple of times over the years.
140463
Cs (cesium) has  an atomic radius of 2.67 angstroms
149911
Density = Mass / Volume\nIf you know any 2 of the above quantities, you can find the other.
908721
they are the last two elements in Group 1 (alkali metals)\n\nthe farther down an element is in a group, the more reactive it is...