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Periodic Table

The Periodic Table is a tabular arrangement of the elements in increasing order oftheir atomic numbers, so that elements with similar properties are in the same column. There are 18 columns, called groups, and seven rows, which are called periods, in the modern periodic table. Questions about the Periodic Table: its history and creation, trends, groups/families, and periods are asked in our Periodic Table category.

35,272 Questions
Science
Chemistry
Periodic Table

What is the fourth element of the periodic table of elements?

Beryllium (Be)

See the Web Links and the Related Questions for more information.

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Mechanical Engineering
Periodic Table
Chemical Bonding
Acids and Bases

List of all nonferrous metals?

That would be all metals that aren't iron or iron alloys.

Yeah, like aluminium, zinc, copper, lead, beryllium, titanium, etc.

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Chemistry
Periodic Table
Atoms and Atomic Structure

What type of element is a protactinium?

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?

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Periodic Table
Energy
Elements and Compounds

What are the first 20 elements of the periodic table?

  1. Hydrogen (H)
  2. Helium (He)
  3. Lithium (Li)
  4. Beryllium (Be)
  5. Boron (B)
  6. Carbon (C)
  7. Nitrogen (N)
  8. Oxygen (O)
  9. Fluorine (F)
  10. Neon (Ne)
  11. Sodium (Na)
  12. Magnesium (Mg)
  13. Aluminium (Al)
  14. Silicon (Si)
  15. Phosphorous (P)
  16. Sulphur (S)
  17. Chlorine (Cl)
  18. Argon (Ar)
  19. Potassium (K)
  20. Calcium (Ca)
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Science
Periodic Table

What are some materials or things that change from solid to gas?

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.

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Health
Biology
Periodic Table
Scientific Method

What is Clinistix and albustix used for?

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.

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Chemistry
Periodic Table
Elements and Compounds
Atomic Mass

What is the mass number of an atom?

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.
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Chemistry
Periodic Table
Elements and Compounds

Which is the hardest metal among the group IA in periodic table?

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

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Chemistry
History of Science
Periodic Table

Who created the periodic table?

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.

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Science
Periodic Table

Who was Demetrius Mendeleev?

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.

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Periodic Table

What color is Tellurium?

Silver-white

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Organic Chemistry
Periodic Table
Elements and Compounds

Why do people use non-aqueous solvents?

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.

321322323
Chemistry
Periodic Table

Colored salts generallly have a cation from which section of the periodic table?

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.

321322323
Chemistry
Periodic Table
Elements and Compounds

What is the average mass of 1 atom of tin?

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

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Chemistry
Periodic Table

How did Henry Moseley organize his periodic table?

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.

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Periodic Table

What color is Mn2 plus?

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

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Chemistry
Periodic Table
Atoms and Atomic Structure

What chemical elements make up a water molecule?

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

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Chemistry
Periodic Table

What grade do you learn the periodic table?

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

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Units of Measure
Periodic Table

Is lead heavier than silver?

Yes, by about 8.2%. (rounded)

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Chemistry
Periodic Table

How are the elements arranged in the periodic table?

They are arranged in ascending order by proton number.

There are eight vertical groups. Elements in each group share similar properties and have the same number of valence electrons. Group I elements have one valence electron, and Group V elements have five valence electrons. Group 0 (the eighth group) elements have either two or eight valence electrons.

The elements are also arranged horizontally in Periods. Hydrogen and helium are in Period 1; lithium, neon and the elements between them are in Period 2; and sodium, argon and the elements between them are in Period 3. So on. The Period an element is in indicates the number of electron shells the atom has. Hydrogen has one shell, sodium has three.

Metals are found on the left side of the periodic table. Non-metals are found on the right side. Elements between Group II and Group III are called transition metals. For example, iron, gold, copper, nickel and silver are all transition metals. Some elements found between metals and non-metals are metalloids, which have properties similar to both metals and non-metals.
They are arranged by increasing atomic number, which is the amount of protons and electrons.

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Chemistry
Acronyms & Abbreviations
Periodic Table

What does 'Ra' stand for in the periodic table?

Radium, the 88th element.

287288289
Periodic Table
Elements and Compounds

Which element is in period 5 group2?

Strontium

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Chemistry
Periodic Table

What is the heaviest element is group 2?

Radium (Ra).

291292293
Periodic Table
Elements and Compounds

What is the chemical symbol for hahnium?

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

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Chemistry
Periodic Table
Elements and Compounds
Density

What is the density of Niobium?

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