The nonmetal elements occupy the upper right-hand corner of the periodic table. Nonmetals include the nonmetal group, the halogens, and the noble gases. These elements have similar chemical properties that differ from the elements considered metals.
The nonmetal element group is a subset of these elements. The nonmetal element group consists of hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur and selenium.
Hydrogen acts as a nonmetal at normal temperatures and pressure and is generally accepted to be part of the nonmetal group.
Properties of nonmetals include:
- dull, not shiny
- poor conductor of heat
- poor conductor of electricity
- high ionization energies
- high electronegativity
- not malleable or ductile, usually brittle
- lower density (when compared to metals)
- lower melting point and boiling points (when compared to metals)
- gains electrons in reactions
This is a list of the nonmetal elements in order of increasing atomic number.
| NUMBER | SYMBOL | ELEMENT |
| 1 | H | Hydrogen |
| 2 | He | Helium |
| 6 | C | Carbon |
| 7 | N | Nitrogen |
| 8 | O | Oxygen |
| 9 | F | Fluorine |
| 10 | Ne | Neon |
| 15 | P | Phosphorus |
| 16 | S | Sulfur |
| 17 | Cl | Chlorine |
| 18 | Ar | Argon |
| 34 | Se | Selenium |
| 35 | Br | Bromine |
| 36 | Kr | Krypton |
| 53 | I | Iodine |
| 54 | Xe | Xenon |
| 85 | At | Astatine |
| 86 | Rn | Radon |
| 117 | Ts | Tennessine |
| 118 | Og | Oganesson |
very usefull stuff
u could also add like in what natural state these exist
like sulphur in S8 ,S6,S7
oxygen in O2
Most metalloids are semiconductors–they have a small electrical conductivity which
increases as their temperature is raised or impurities are added. The exceptions are
arsenic and antimony. These elements exhibit an extreme form of allotropy; the room
temperature allotropes, although brittle are metallc conductors (specific resistivity:
arsenic 35 micro-ohm-cm; antimony 42 micro-ohm cm–but they have nonmetallic,
nonconducting allotropes at low temperatures. By contrast, Germanium has a
specific resistivity of 60 ohm-cm or 60,000,000 micro-ohm cm; tellurium, 430,000
micro-ohm-cm. Quite a difference. In metals, electrical conductivity decreases
slightly as temperature increases and decreases if it is lowered. Some metals–e.g.
tin and lead–lose ALL of their electrical resistance at low temperatures and become
perfect electrical conductors–a phenomenon known as superconductivity. An
experiment was done a few years ago where an electrical current was started in a
lead ring. Three years later it was still circulating undiminished. Of course this
phenomenon only takes place at very low temperatures–just a few degrees above
absolute zero.
Correction: the electrical conductivity of a metal increases if its temperature is
lowered.
Good for knowledge
VERY GOOD….
Nice one!!
nice it helps me
🙂
you could also add atomic mass and each metals physical properties
Plz tell me what is written on number 53 symbol,I or L
I for Iodine