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)....
1) It is based on atomic number rather than atomic mass. 2) It is most accurate and widely used table.
Many people thought of the idea, but we have given credit toDmitri Mendeleev in 1869. I think its because he took the ideafurther and inscribed detail into his table, even predicting futureelements. However, Lothar Meyer has also produced a similar versionat essentially the same time as Dmitri...
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 (thesame goes for down).
5869 degrees Kelvin. Rhenium would be the last element to go, withtungsten right before at 5555 degrees Celsius.
The group 4 contain: titanium, zirconium, hafnium, rutherfordium. For the general properties of these elements read the link below.
It depends on how you eat it. If you eat pure baking soda, you will be very unhappy--it tastesreally bad--but it won't hurt you because you couldn't eat enoughof it to throw your body's pH off. It will react with yourstomach's acid to neutralize it, which is why people take it forindigestion. If you...
the reason for this is because of the electromagnetic force, where opposite charges attract. The further right you go, the more electron and protons there are, therefore, because protons are in the nucleus (center) and electrons are in the electron cloud (outside the nucleus) the electron cloud is...
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 andnon-metals' but I can tell you how the flame test actually works.Although we use this test in Chemistry to identify elements, theexplanation behind it is actually physics. .
Basically, when an element is heated the electrons becomeexcited, this...
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
Helium Neon Organ Xenon krypton radon
Yes you can see it in to the Periodic Table of Elements You can see the new elements below the pic
Some elements as iron, mercury, copper, tin, sulfur, gold, silver, carbon, etc. are known from prehistoric times.
I'm not 100% sure what you mean by 'common elements' but I willjust try to explain trends in bonding across the periodictable. .
So, groups 1,2, and Al, Ga, In, Tl, Ge, Sn, Pb, Sb, Bi and Poare all metal so all form metallic bonds the strength of these bondincrease as we move across the groups as...
florine chlorine bromine iodine
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 configurationi.e. complete duplet (He) and octat e.g. Ne, Ar etc .
The periodic table of Mendeleev contain only chemical elemewnts; or magnalium is an alloy - aluminium with 1-2 % magnesium.
Lead is not actually an exception to the trend of melting pointsin metals. As you go down the groups, the mpt of the metalsdecrease because there is more shielding around the nucleus and theelectrons are not as attracted [to the nucleus]. Although thenuclear charge is greater in, for example...
The energy sublevel (s, p, d ,f) is always the same.
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 the5s 1 electron in its outer energy level which makes itvery reactive. So, if we were to drop some rubidium in water itwould react rapidly to produce smoke and small sparks. .
There are lots of YouTube videos of this reaction so take alook.
Yes, that is the only reason. Both are the F sublevel when dealing with orbials.
Because the elements are grouped according to similarcharacteristics. Even by knowing where an element is on theperiodic table based solely on its proton number, we can stillpredict its properties by using its position on the periodic table.
it's presence is known from ancient times.
Uh... you left out the "following" part. Neon has 10 protons, 10 electrons, and 10 neutrons. It is a noble gas and has a full valence engergy level (2p) and satisfies its octet rule. Nobles gases are extremely stable, making it difficult to react them with anything.
All elements have luster, just different types. Metals have very shiny lusters. Nonmetals have very dull lusters. Metalloids are usually a mixture of the two, or one of the other. For example, Silicon is very brittle (like most nonmetals are) but has a shiny luster (like most metals)
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 asarcoplasmic 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 thereforehas less ability to attract the electrons in the covalent bond andtherefor the H becomes slightly positive [denoted as delta+] andthe O becomes slightly negative [denoted as delta-]. .
There will be electronegativity where any two...
nonmetals are the best insulators
Krypton! (Crypt-ton), ton = 2000 lb, crypt = deathchamber.
Going from most polar to least Caffeine > Acetaminophen > Acetylsalicylic acid > Ibuprofen
No one discovered the periodic table, it was an invention to organize elements made by Dmitri Mendeleev
Because they have different amounts of outer electrons and electronconfigurations. The electron configurations define the structureand bonding of the elements which defines the properties. However,elements in the same groups have the same amount of outer electronsand therefore the same structure and...
ccl4 is more viscous then other two
Lother Mayer , .
It all started with the discovery of individual elements likegold, silver, copper. The discovery of the number of elementsincreases, therefore the scientists classified the elements on thebasis 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 theperiodic table...
They each have three electrons in their outermost shell with thevalence electron configuration ns2np1. The boron family adoptsoxidation states +3 or +1.
all of them are very rare in the earth's crust
Because they only have 1 valence electron
they can be called groups or families
Iridium's classification is a metal.
because research on them is being contined
No, ionisation energies change depending on which element youlook at and which ionisation (i.e. 1st, 2nd, 3rd...) you are takingabout. .
For example, as you go across period 3, the 1st ionisationenergy generally increases. .
- sodium (Na) has the lowest I.E.* as it has the lowest nuclearcharge *...
elements that are yet to be discovered
Sr is the symbol of the element strontium.
Molecular formulas are a compact chemical notation that describethe type and number of atoms in a single molecule of acompound. .
Yes, but an electron configuration could be that of an ion. The identification of an element depends on the number of protons in its nucleus, so only when the species is also neutral can the electron configuration be used to identify it. Examples 1s 2 2s 2 2p 6 is the electron configuration of...
it is an alloy of various metals which make it shiny
All the elements on the periodic table left of and including boron, aluminium, gallium, indium, and thallium are metals. To the right are metalloids (semi-metals) or non-metals.
Water isn't on the periodic table as it is a compound and only elements are on the periodic table
They have a full outer energy level ( full energy shell for GCSEand below ) which makes them completely unreactive* which is whythey are called the noble gasses. .
*Xe can actually react
litium, and elements in the 2nd period (row) are pretty common
The name thorium is derived from the Scandinavian deity oh thunder - Thor.
Electronegativity decreases as you move down in a column.
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 theelements.and arranged them in ascending atomic number
In ascending order: neon aluminium sulphur oxygen (3.5)
These are the pnictogens and you can remember them by the first two letters of two pnictogens. P, phosphorus; N, nitrogen.
he arranged it in the relative atomic mass order
The number of valence electrons
There is no element with the symbol Ci. The closest would Cl, which is chlorine, number 17 on the periodic table.
Humans need a some amount of certain metals to function normally.Most metals are used as cofactors in enzymes, catalyzing usefulreactions and serving important roles.
You mix compound A with compound B and something magical will hapen
That would be the noble gases
Because the symbols on the periodic table are derived from the Latin and/or Greek names for the elements. For example, Iron is noted on the table as Fe, derived from the Latin name of ferrum, as in ferrous oxide (the chemical name for rust). -------------------------- Also, the chemical symbols...
No its a transition metal
They're arranged in rows on how much protons they have, then divided into periods by how many energy levels they have.
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
[Xe]4f 14 5d 10 6s 2 6p 3 .