Periodic Table

Beryllium (Be) See the Web Links and the Related Questions for more information.

That would be all metals that aren't iron or iron alloys. Yeah, like aluminium, zinc, copper, lead, beryllium, titanium, etc.

Hydrogen (H) Helium (He) Lithium (Li) Beryllium (Be) Boron (B) Carbon (C) Nitrogen (N) Oxygen (O) Fluorine (F) Neon (Ne) Sodium (Na) Magnesium (Mg) Aluminium (Al) Silicon (Si) Phosphorous (P) Sulphur (S) Chlorine (Cl) Argon (Ar) Potassium (K) Calcium (Ca)

I'm not too bad at chemistry, but one thing I can't wrap my head around is how perfect the periodic table is. How is it that each element that we know is only one more proton than the last? How come it goes in PERFECT order instead of having a few elements with protons not perfectly linear to the periodic table?

Sublimation is where a solid turns into a gas directly without a liquid stage. Many solids are able to do this under the right temperature and pressure conditions. Common examples are mercuric chloride, iodine, and carbon dioxide.

Clinistix is a commercially available product for testing for of glucose in urine. It turns purple if glucose is present. Albustix is a commercially available product for testing for the presence protein in urine.

Lithium (Li), with a Mohs hardness of 0,6.

The first periodic table was developed by Dmitri Mendeleev in the mid-19th century.He wasn't the only person thinking along those lines ... both John Newlands and Lothar Meyer had proposed similar ideas However, Newlands was largely criticized and ignored at the time, and Meyer didn't make any predictions, so Mendeleev's table (which did make predictions about the properties of several as-yet-undiscovered elements) is generally regarded as the first.

He made the first periodic table by taking the elements he knew, and arranging them according to atomic mass. He then discovered a pattern in his table, and left empty spaces for elements yet to be discovered.

Silver-white

A mass number is the total number of protons and neutrons found in an atom. To find the mass number, you must know the number of neutrons in that particular isotope of the element and then add the atomic number (same as the number of protons) to it. When this number is definite it is called a nuclide and the symbol is written with a superscript giving the mass number and a subscript giving the atomic number (number of protons) placed in front of atomic symbol: 2311Na. It can also be written after the elements name, sodium-23. Do not confuse this with the atomic number, which is the number of protons. .

Henry Moseley did a series of experiments looking at the x-ray spectra of various elements. He found that the frequencies of equivalent bands made a very simple progression that more or less corresponded to atomic weight order. The exceptions were exactly the same as the ones where Mendeleev's scheme was having difficulties. He thus arrived at a definition of atomic number, and proposed a revised periodic law where the ordering of elements was according to atomic number rather than atomic weight.

Different reactions require different solvents. Sometimes the polarity of H2O can hinder the progression of the reaction by H-bonding to the reactants. Also, sometimes a reaction requires a stronger or weaker solvent to insure that you have your reactants reacting and not a reactant with the solvent.

Coloured salts generally have a cation which is a transition metal. Iron, Chromium, Manganese, Vanadium and Copper all are examples of transition metals that make colourful salts. Notice that there are exceptions - particularly the period 6 main group metals like lead share some of the properties of the transition group metals and can make colourful salts - the bright yellow precipitate of lead iodide (PbI) is an example commonly used as demonstration of precipitation reactions.

The work for this would be 118.96 grams per mole of tin, then divide that number by avogadro's number, 6.022x10^23.

white. Salts of Mn(2+) complexed with water are usually a pale salmon pink colour.

2 Hydrogen(H) atoms and 1 oxygen(O) atom make up a water molecule.

You should learn the Periodic Table whenever you take Chemistry in high school. Most people are a sophomore in high school when taking chemistry.

Elements are arranged on the periodic table in the order of the atomic number, in groups and periods.

Yes, by about 8.2%. (rounded)

Radium, the 88th element.

Strontium

Radium (Ra).

Hahnium was a proposed name for element 105 but was rejected by IUPAC in favor of (Db) dubnium.

Density: 8.57 Grams Per Cubic Centimeter