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Periodic Table

Parent Category: Chemistry
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.
Not all elements are radioactive. Only elements having atomicnumber more than 83 are considered having radioactive nature(radio-isotopes). The elements with atomic number less than 83 areconsidered stable. OLDER ANSWER:Theoretically they all are, it is just a matter ofdecay-speed(radioactivity)....
An octet electron arrangement is where an atom has 8 valence electrons. It's very stable and unreactive. Some metal atoms tend to donate its electrons and the electrons accepted by non-metal atom. This is called ionic bonding. Some non-metal electron share electron among themselves to achieve...
Complexity. As you go right, each element gets more complex (the  same goes for down).
5869 degrees Kelvin. Rhenium would be the last element to go, with  tungsten right before at 5555 degrees Celsius.
It depends on how you eat it.   If you eat pure baking soda, you will be very unhappy--it tastes  really bad--but it won't hurt you because you couldn't eat enough  of it to throw your body's pH off. It will react with your  stomach's acid to neutralize it, which is why people take it for ...
The modern table is ordered by atomic mass and arranged to putelements with similar chemical properties together.
Metals, Non-metals and Metalloids (semi metals)
I'm not too sure what you mean by 'due to the metals and  non-metals' but I can tell you how the flame test actually works.  Although we use this test in Chemistry to identify elements, the  explanation behind it is actually physics.  Basically, when an element is heated the electrons become ...
Flourine, with highest electronegativity value of 4.
Mercury is a very dangerous element. It is element number 80.Its atomic weight is 200.59.Its melting point is -37.89 degrees F. Its boiling point is 674.11degrees F. Its period number is 6.Its group number is 12.Named after theplanet Mercury. Mercury chemical symbol comes from the Greek word,...
Because it happened in a certain period of time
I'm not 100% sure what you mean by 'common elements' but I will  just try to explain trends in bonding across the periodic  table.  So, groups 1,2, and Al, Ga, In, Tl, Ge, Sn, Pb, Sb, Bi and Po  are all metal so all form metallic bonds the strength of these bond  increase as we move across the...
Group 1 and group 2 metals react with water to form metallic hydroxides and hydrogen gas. These reactions are vigorously exothermic, and can result in the hydrogen gas igniting, causing an impressive explosion. For example, when pure sodium (Na) is added to water, it reacts quickly to produce...
Yes. Diamond is a crystalline allotrope of the element carbon.  Carbon, although electrically conductive, is not a metal.
The name of element 85, astatine", is derived from the Greek"astatos", meaning unstable, with the ending "-ine" that is part ofthe names of the names all five halogens making up Group 17 of theperiodic table: astatine (At), bromine (Br), chlorine (Cl),fluorine (F), and iodine (I).
These are Nobel gases, have stable elecronic configuration  i.e. complete duplet (He) and octat e.g. Ne, Ar etc   .
Lead is not actually an exception to the trend of melting points  in metals. As you go down the groups, the mpt of the metals  decrease because there is more shielding around the nucleus and the  electrons are not as attracted [to the nucleus]. Although the  nuclear charge is greater in, for...
They are the same number. Or should I say one is the number, the other is the quantity (mole).
Ionization energy is an atoms ability to hold on to its valence electrons. Flourine (F) has the highest, and Francium (Fr) has the lowest. This value decreases from top to bottom and from right to left.
Transition metals have a variety of properties, but one of the largest is that transition metals, in most cases, don't have a set charge. Depending on what anion they are paired with, their charge will change anywhere from 1 to 7.
As rubidium is a group one element, it has only the  5s1 electron in its outer energy level which makes it  very reactive. So, if we were to drop some rubidium in water it  would react rapidly to produce smoke and small sparks.  There are lots of YouTube videos of this reaction so take a  look....
Because the elements are grouped according to similar  characteristics. Even by knowing where an element is on the  periodic table based solely on its proton number, we can still  predict its properties by using its position on the periodic table.
it's presence is known from ancient times.
Nope. He was the first identifier of periodicity.
It determines its place in reactivity. Usually gasesous elements are the electron recipients, except when it's gaseous-to-gaseous reactions (like combustion which turns a hydrocarbon into carbon dioxide and water vapor) while the metals generally are the donors. A case in point is HCl and NaOH make...
For skeletal muscle, a triad includes a T tubule with a  sarcoplasmic reticulum and a terminal cisterna on either side.  Within a muscle fiber there are thousands of triads.
Yes, tin (Sn) is lustrous.
In water H binds with 2O H has the smaller nucleus and therefore  has less ability to attract the electrons in the covalent bond and  therefor the H becomes slightly positive [denoted as delta+] and  the O becomes slightly negative [denoted as delta-].  There will be electronegativity where any...
Krypton! (Crypt-ton), ton = 2000 lb, crypt = death  chamber.
Because they have different amounts of outer electrons and electron  configurations. The electron configurations define the structure  and bonding of the elements which defines the properties. However,  elements in the same groups have the same amount of outer electrons  and therefore the same...
ccl4 is more viscous then other two
 Doberiner,  Lother Mayer,  Newland,  Mendeleev,  Brazillius   
It all started with the discovery of individual elements like  gold, silver, copper. The discovery of the number of elements  increases, therefore the scientists classified the elements on the  basis of their properties in the periodic table.
The four predicted elements lighter than the rare earth elements,  ekaboron (Eb), ekaaluminium (Ea), ekamanganese (Em), and ekasilicon  (Es), proved to be good predictors of the properties of scandium,   gallium,  technetium and  germanium respectively, which each fill the spot in the ...
They each have three electrons in their outermost shell with the  valence electron configuration ns2np1. The boron family adopts  oxidation states +3 or +1.
all of them are very rare in the earth's crust
Iridium's classification is a metal.
because research on them is being contined
No, ionisation energies change depending on which element you  look at and which ionisation (i.e. 1st, 2nd, 3rd...) you are taking  about.  For example, as you go across period 3, the 1st ionisation  energy generally increases.  - sodium (Na) has the lowest I.E.* as it has the lowest nuclear ...
elements that are yet to be discovered
Sr is the symbol of the element strontium.
  Molecular formulas are a compact chemical notation that describe  the type and number of atoms in a single molecule of a  compound.            
it is an alloy of various metals which make it shiny
They have a full outer energy level ( full energy shell for GCSE  and below ) which makes them completely unreactive* which is why  they are called the noble gasses.  *Xe can actually react 
there are no good effects of taking in cadium compounds
 In 1869, a Russian chemist named  Dmitri Mendeleev came up with a way of organizing the  elements.and arranged them in ascending atomic number
oxygen and mercury
he arranged it in the relative atomic mass order
Humans need a some amount of certain metals to function normally.  Most metals are used as cofactors in enzymes, catalyzing useful  reactions and serving important roles.
You mix compound A with compound B and something magical will hapen
No its a transition metal
Symbols of the chemical elements are abbreviated forms of thenames.
the nobles gases are the greatest ionization group
LuBrICaTiON is a 11 letter word that comes from the periodic table
there are 18 numbered groups in the periodic table which is  arranged according to atomic numbers
At STP,  hydrogen is a nontoxic, nonmetallic, odorless, tasteless,  colourless, and highly combustible diatomic gas. formulae H2
hydrogen has 1 electron in its valence shell
it is called the sodium monooxide but it is unstable as oxygen has  -2 valency and sodium has +1
carbon the group 14 element has 6 electrons also called the pseudo  stable elctrons as they are half balanced. they are stable elements  with moderate electronegativity
the elements in the periodic table are arranged according to the  increasing atomic number and hence the elements are divided into 18  groups hence it would be easy to identify the elements
he traind to be a fire man so he could train with cemicals so he could what propoteas thay containd!
 Antoine-Laurent de Lavoisier and  John Newlands were first to dicover the table but later the  scientist named dimitri mendeleev full arranged the elements  discovered at that time
the last group or the 18th group of the table the helium group  known as noble gases are known as inert gases
the common group elements have same number of valence electron in  outermost shell and exibits same kind of property
  Period is  called the elements are arranged in a series of rows so that those  with similar properties appear in a column.   
Scandium, I believe it has something to do with that fact that it has the ability to have a double bond in ionic bonds. These diamagnetic metals between transition metals from the period 4 are copper and zinc.
the exposure of water or moisture to the iron nail will convert the  element to fe+3
lithium is commonly used in the making of the batteries. it is the  group 1 element
these elements have 5 electron in the valence shells and have  configuration of ns np5
Atomic mass hydrogen = 1.01 Formula- grams × (6.02 × 1023) / atomic mass = number of atoms 18 grams H × (6.02 × 1023) / 1.01 grams = 107.29 × 1023 atoms of hydrogen
these are the elements name according to the origion or the greek  names hence symbols are there
the group 14 elements are the carbon family with 4 valence electron  in last shell also called as tetragens or crystallogens
he was the man behind the discovery of periodic table according to  the atomic numbers
All elements of group 1 have one valence electrons
the periodic table gives the proper arrangement of the metals  according to their properties in a group and hence they are easily  reachablede and changed our lives
the groups varied from 1 to 18 from left to right from metals in  group 1 and 2 to noble gases in 18 group
what year did dmitrie mendeleev discover the periodic table
it is poisonous gas which is the cause of the green house effect  and also contribute to the global warming
usually it is the second to third layer of electrons. it depends on what atom ur talking about, some atoms (like magnesium) have 3 electron levels; when some atoms (like gold) may have over 7 levels of electrons. it sometimes has to do with the atomic number
these gases are the noble gases or inert gases. They are non  reactive and have stable valence electrons
Rubidium was discovered in 1861. No one know's the exact date.
Use an acronym; here are a couple: Hi - Hydrogen (H) Hello - Helium (He) Lina - Lithium (Li) Beena - Beryllium (Be) Bought - Boron (B) Cashew - Carbon (C) Nuts - Nitrogen (N) On - Oxygen (O) Friday - Fluorine (F) Neela - Neon (Ne) Natalie - Sodium (Na) Mgan - Magnesium (Mg) All -...
cerium is atomic number 58 element and is in lanthanoide family and  is a transition metal
the size of cations decreases as we go left to right in the  periodic table
molecules are the small structure which are formed by the atoms. it  helps in building of the large heavy structure